diff --git a/include/common/tvariant.h b/include/common/tvariant.h
index 13c8aff8e724907217fff0c5629c991610c8d2c3..7143d7b8fdc8214bd40134805168606e985f92f6 100644
--- a/include/common/tvariant.h
+++ b/include/common/tvariant.h
@@ -36,6 +36,8 @@ typedef struct SVariant {
   };
 } SVariant;
 
+int32_t toInteger(const char* z, int32_t n, int32_t base, int64_t* value, bool* issigned);
+
 bool taosVariantIsValid(SVariant *pVar);
 
 void taosVariantCreate(SVariant *pVar, char* z, int32_t n, int32_t type);
diff --git a/source/common/CMakeLists.txt b/source/common/CMakeLists.txt
index d03231fcfbcbdd9fdedab59c0b7c82e8195d5936..1ff83b091d27d36d3ab86e35fafe95ec7240e55f 100644
--- a/source/common/CMakeLists.txt
+++ b/source/common/CMakeLists.txt
@@ -10,4 +10,6 @@ target_link_libraries(
     PUBLIC os
     PUBLIC util
     INTERFACE api
-)
\ No newline at end of file
+)
+
+ADD_SUBDIRECTORY(test)
diff --git a/source/common/src/sqlcmdstr.c b/source/common/src/tmsgtype.c
similarity index 100%
rename from source/common/src/sqlcmdstr.c
rename to source/common/src/tmsgtype.c
diff --git a/source/common/src/tvariant.c b/source/common/src/tvariant.c
index 5dcad85718a0f659d8c5a6f863b431eede8c391e..a218353ae3c4a51a7c2a1827bb5ba8116f8f6264 100644
--- a/source/common/src/tvariant.c
+++ b/source/common/src/tvariant.c
@@ -15,8 +15,8 @@
 #include "os.h"
 
 #include "taos.h"
-#include "thash.h"
 #include "taosdef.h"
+#include "thash.h"
 #include "ttime.h"
 #include "ttokendef.h"
 #include "ttypes.h"
@@ -39,6 +39,42 @@
     assert(0);                                                      \
   } while (0)
 
+int32_t toInteger(const char* z, int32_t n, int32_t base, int64_t* value, bool* isSigned) {
+  errno = 0;
+  char* endPtr = NULL;
+
+  int32_t index = 0;
+
+  bool specifiedSign = (z[0] == '+' || z[0] == '-');
+  if (specifiedSign) {
+    *isSigned = true;
+    index = 1;
+  }
+
+  uint64_t val = strtoull(&z[index], &endPtr, base);
+  if (errno == ERANGE || errno == EINVAL) {
+    errno = 0;
+    return -1;
+  }
+
+  if (specifiedSign && val > INT64_MAX) {
+    return -1;
+  }
+
+  if (endPtr - &z[index] != n - index) {
+    return -1;
+  }
+
+  *isSigned = specifiedSign || (val <= INT64_MAX);
+  if (*isSigned) {
+    *value = (z[0] == '-')? -val:val;
+  } else {
+    *(uint64_t*) value = val;
+  }
+
+  return 0;
+}
+
 void taosVariantCreate(SVariant *pVar, char* z, int32_t n, int32_t type) {
   int32_t ret = 0;
   memset(pVar, 0, sizeof(SVariant));
@@ -52,7 +88,6 @@ void taosVariantCreate(SVariant *pVar, char* z, int32_t n, int32_t type) {
       } else {
         return;
       }
-
       break;
     }
 
@@ -60,38 +95,38 @@ void taosVariantCreate(SVariant *pVar, char* z, int32_t n, int32_t type) {
     case TSDB_DATA_TYPE_SMALLINT:
     case TSDB_DATA_TYPE_BIGINT:
     case TSDB_DATA_TYPE_INT:{
-//      ret = tStrToInteger(token->z, token->type, token->n, &pVar->i64, true);
-//      if (ret != 0) {
-//        SToken t = {0};
-//        tGetToken(token->z, &t.type);
-//        if (t.type == TK_MINUS) {  // it is a signed number which is greater than INT64_MAX or less than INT64_MIN
-//          pVar->nType = -1;   // -1 means error type
-//          return;
-//        }
-//
-//        // data overflow, try unsigned parse the input number
-//        ret = tStrToInteger(token->z, token->type, token->n, &pVar->i64, false);
-//        if (ret != 0) {
-//          pVar->nType = -1;   // -1 means error type
-//          return;
-//        }
-//      }
+      bool sign = true;
+
+      int32_t base = 10;
+      if (type == TK_HEX) {
+        base = 16;
+      } else if (type == TK_OCT) {
+        base = 8;
+      } else if (type == TK_BIN) {
+        base = 2;
+      }
 
+      ret = toInteger(z, n, base, &pVar->i64, &sign);
+      if (ret != 0) {
+        pVar->nType = -1;   // -1 means error type
+        return;
+      }
+
+      pVar->nType = (sign)? TSDB_DATA_TYPE_BIGINT:TSDB_DATA_TYPE_UBIGINT;
       break;
     }
-
     case TSDB_DATA_TYPE_DOUBLE:
     case TSDB_DATA_TYPE_FLOAT: {
       pVar->d = strtod(z, NULL);
       break;
     }
-
     case TSDB_DATA_TYPE_BINARY: {
       pVar->pz = strndup(z, n);
       pVar->nLen = strRmquote(pVar->pz, n);
       break;
     }
     case TSDB_DATA_TYPE_TIMESTAMP: {
+      assert(0);
       pVar->i64 = taosGetTimestamp(TSDB_TIME_PRECISION_NANO);                           
       break;                             
     }                            
diff --git a/source/common/test/CMakeLists.txt b/source/common/test/CMakeLists.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f4c849780db37fed93b93d800da1a50d75af53b5
--- /dev/null
+++ b/source/common/test/CMakeLists.txt
@@ -0,0 +1,18 @@
+
+MESSAGE(STATUS "build parser unit test")
+
+# GoogleTest requires at least C++11
+SET(CMAKE_CXX_STANDARD 11)
+AUX_SOURCE_DIRECTORY(${CMAKE_CURRENT_SOURCE_DIR} SOURCE_LIST)
+
+ADD_EXECUTABLE(commonTest ${SOURCE_LIST})
+TARGET_LINK_LIBRARIES(
+        commonTest
+        PUBLIC os util common gtest
+)
+
+TARGET_INCLUDE_DIRECTORIES(
+        commonTest
+        PUBLIC "${CMAKE_SOURCE_DIR}/include/libs/common/"
+        PRIVATE "${CMAKE_SOURCE_DIR}/source/libs/common/inc"
+)
diff --git a/source/common/test/commonTests.cpp b/source/common/test/commonTests.cpp
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..2f821ee8b91dd8c5d9ff6b7e18c129c51618074e 100644
--- a/source/common/test/commonTests.cpp
+++ b/source/common/test/commonTests.cpp
@@ -0,0 +1,96 @@
+#include <gtest/gtest.h>
+#include <iostream>
+#pragma GCC diagnostic ignored "-Wwrite-strings"
+
+#pragma GCC diagnostic ignored "-Wunused-function"
+#pragma GCC diagnostic ignored "-Wunused-variable"
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
+#pragma GCC diagnostic ignored "-Wsign-compare"
+#include "os.h"
+
+#include "taos.h"
+#include "tvariant.h"
+#include "tdef.h"
+
+namespace {
+//
+}  // namespace
+
+int main(int argc, char** argv) {
+  testing::InitGoogleTest(&argc, argv);
+  return RUN_ALL_TESTS();
+}
+
+TEST(testCase, toInteger_test) {
+  char*    s = "123";
+  uint32_t type = 0;
+
+  int64_t val = 0;
+  bool sign = true;
+
+  int32_t ret = toInteger(s, strlen(s), 10, &val, &sign);
+  ASSERT_EQ(ret, 0);
+  ASSERT_EQ(val, 123);
+  ASSERT_EQ(sign, true);
+
+  s = "9223372036854775807";
+  ret = toInteger(s, strlen(s), 10, &val, &sign);
+  ASSERT_EQ(ret, 0);
+  ASSERT_EQ(val, 9223372036854775807);
+  ASSERT_EQ(sign, true);
+
+  s = "9323372036854775807";
+  ret = toInteger(s, strlen(s), 10, &val, &sign);
+  ASSERT_EQ(ret, 0);
+  ASSERT_EQ(val, 9323372036854775807u);
+  ASSERT_EQ(sign, false);
+
+  s = "-9323372036854775807";
+  ret = toInteger(s, strlen(s), 10, &val, &sign);
+  ASSERT_EQ(ret, -1);
+
+  s = "-1";
+  ret = toInteger(s, strlen(s), 10, &val, &sign);
+  ASSERT_EQ(ret, 0);
+  ASSERT_EQ(val, -1);
+  ASSERT_EQ(sign, true);
+
+  s = "-9223372036854775807";
+  ret = toInteger(s, strlen(s), 10, &val, &sign);
+  ASSERT_EQ(ret, 0);
+  ASSERT_EQ(val, -9223372036854775807);
+  ASSERT_EQ(sign, true);
+
+  s = "1000u";
+  ret = toInteger(s, strlen(s), 10, &val, &sign);
+  ASSERT_EQ(ret, -1);
+
+  s = "0x10";
+  ret = toInteger(s, strlen(s), 16, &val, &sign);
+  ASSERT_EQ(ret, 0);
+  ASSERT_EQ(val, 16);
+  ASSERT_EQ(sign, true);
+
+  s = "110";
+  ret = toInteger(s, strlen(s), 2, &val, &sign);
+  ASSERT_EQ(ret, 0);
+  ASSERT_EQ(val, 6);
+  ASSERT_EQ(sign, true);
+
+  s = "110";
+  ret = toInteger(s, strlen(s), 8, &val, &sign);
+  ASSERT_EQ(ret, 0);
+  ASSERT_EQ(val, 72);
+  ASSERT_EQ(sign, true);
+
+  //18446744073709551615  UINT64_MAX
+  s = "18446744073709551615";
+  ret = toInteger(s, strlen(s), 10, &val, &sign);
+  ASSERT_EQ(ret, 0);
+  ASSERT_EQ(val, 18446744073709551615u);
+  ASSERT_EQ(sign, false);
+
+  s = "18446744073709551616";
+  ret = toInteger(s, strlen(s), 10, &val, &sign);
+  ASSERT_EQ(ret, -1);
+}
diff --git a/source/libs/parser/inc/astGenerator.h b/source/libs/parser/inc/astGenerator.h
index 14fa6152adb3883082f2493ed55a2681e05e480e..bf32bd6af96fc755694b337471339a34b1377c4d 100644
--- a/source/libs/parser/inc/astGenerator.h
+++ b/source/libs/parser/inc/astGenerator.h
@@ -277,6 +277,7 @@ bool      tSqlExprIsParentOfLeaf(tSqlExpr *pExpr);
 void      tSqlExprDestroy(tSqlExpr *pExpr);
 SArray *  tSqlExprListAppend(SArray *pList, tSqlExpr *pNode, SToken *pDistinct, SToken *pToken);
 void      tSqlExprListDestroy(SArray *pList);
+void      tSqlExprEvaluate(tSqlExpr* pExpr);
 
 SSqlNode *tSetQuerySqlNode(SToken *pSelectToken, SArray *pSelNodeList, SRelationInfo *pFrom, tSqlExpr *pWhere,
                            SArray *pGroupby, SArray *pSortOrder, SIntervalVal *pInterval, SSessionWindowVal *ps,
diff --git a/source/libs/parser/inc/parserInt.h b/source/libs/parser/inc/parserInt.h
index 676b9f3d3130ce3ded2f06d1c2d667f04f15b069..cd01b60d703558ffe7276270694e2300f0ca5c34 100644
--- a/source/libs/parser/inc/parserInt.h
+++ b/source/libs/parser/inc/parserInt.h
@@ -46,6 +46,16 @@ typedef struct SInsertStmtInfo {
  */
 int32_t qParserValidateSqlNode(struct SCatalog* pCatalog, SSqlInfo* pSqlInfo, SQueryStmtInfo* pQueryInfo, int64_t id, char* msg, int32_t msgLen);
 
+/**
+ *
+ * @param pNode
+ * @param tsPrecision
+ * @param msg
+ * @param msgBufLen
+ * @return
+ */
+int32_t evaluateSqlNode(SSqlNode* pNode, int32_t tsPrecision, char* msg, int32_t msgBufLen);
+
 /**
  *
  * @param pSqlNode
diff --git a/source/libs/parser/inc/parserUtil.h b/source/libs/parser/inc/parserUtil.h
index c4e821a4c9c93d6b547505fb2d2e63050db2a1e7..ee69abf6c56640f207e6aebe294e172ec7c8e523 100644
--- a/source/libs/parser/inc/parserUtil.h
+++ b/source/libs/parser/inc/parserUtil.h
@@ -23,7 +23,8 @@ extern "C" {
 #include "os.h"
 #include "ttoken.h"
 
-int32_t parserValidateNameToken(SToken* pToken);
+int32_t parserValidateIdToken(SToken* pToken);
+int32_t parserSetInvalidOperatorMsg(char* dst, int32_t dstBufLen, const char* msg);
 
 #ifdef __cplusplus
 }
diff --git a/source/libs/parser/src/astGenerator.c b/source/libs/parser/src/astGenerator.c
index 2c5f0f90a4fc976e6bccccf65be269dca0b85022..e9517758d1086eb2b8fe8ee005a0318ba6c3d5ae 100644
--- a/source/libs/parser/src/astGenerator.c
+++ b/source/libs/parser/src/astGenerator.c
@@ -18,52 +18,6 @@
 #include "astGenerator.h"
 #include "tmsgtype.h"
 
-int32_t tStrToInteger(const char* z, int16_t type, int32_t n, int64_t* value, bool issigned) {
-  errno = 0;
-  int32_t ret = 0;
-
-  char* endPtr = NULL;
-  if (type == TK_FLOAT) {
-    double v = strtod(z, &endPtr);
-    if ((errno == ERANGE && v == HUGE_VALF) || isinf(v) || isnan(v)) {
-      ret = -1;
-    } else if ((issigned && (v < INT64_MIN || v > INT64_MAX)) || ((!issigned) && (v < 0 || v > UINT64_MAX))) {
-      ret = -1;
-    } else {
-      *value = (int64_t) round(v);
-    }
-
-    errno = 0;
-    return ret;
-  }
-
-  int32_t radix = 10;
-  if (type == TK_HEX) {
-    radix = 16;
-  } else if (type == TK_BIN) {
-    radix = 2;
-  }
-
-  // the string may be overflow according to errno
-  if (!issigned) {
-    const char *p = z;
-    while(*p != 0 && *p == ' ') p++;
-    if (*p != 0 && *p == '-') { return -1;}
-
-    *value = strtoull(z, &endPtr, radix);
-  } else {
-    *value = strtoll(z, &endPtr, radix);
-  }
-
-  // not a valid integer number, return error
-  if (endPtr - z != n || errno == ERANGE) {
-    ret = -1;
-  }
-
-  errno = 0;
-  return ret;
-}
-
 SArray *tListItemAppend(SArray *pList, SVariant *pVar, uint8_t sortOrder) {
   if (pList == NULL) {
     pList = taosArrayInit(4, sizeof(SListItem));
@@ -173,7 +127,6 @@ SRelationInfo *addSubquery(SRelationInfo *pRelationInfo, SArray *pSub, SToken *p
 }
 
 // sql expr leaf node
-// todo Evalute the value during the validation process of AST.
 tSqlExpr *tSqlExprCreateIdValue(SToken *pToken, int32_t optrType) {
   tSqlExpr *pSqlExpr = calloc(1, sizeof(tSqlExpr));
 
@@ -189,34 +142,10 @@ tSqlExpr *tSqlExprCreateIdValue(SToken *pToken, int32_t optrType) {
     pSqlExpr->tokenId = optrType;
     pSqlExpr->type = SQL_NODE_VALUE;
   } else if (optrType == TK_INTEGER || optrType == TK_STRING || optrType == TK_FLOAT || optrType == TK_BOOL) {
-//    if (pToken) {
-//      toTSDBType(pToken->type);
-//      tVariantCreate(&pSqlExpr->value, pToken);
-//    }
     pSqlExpr->tokenId = optrType;
     pSqlExpr->type = SQL_NODE_VALUE;
-  } else if (optrType == TK_NOW) {
-    // use nanosecond by default TODO set value after getting database precision
-//    pSqlExpr->value.i64 = taosGetTimestamp(TSDB_TIME_PRECISION_NANO);
-//    pSqlExpr->value.nType = TSDB_DATA_TYPE_BIGINT;
-    pSqlExpr->tokenId = TK_TIMESTAMP;  // TK_TIMESTAMP used to denote the time value is in microsecond
-    pSqlExpr->type = SQL_NODE_VALUE;
-//    pSqlExpr->flags |= 1 << EXPR_FLAG_NS_TIMESTAMP;
-  } else if (optrType == TK_VARIABLE) {
-    // use nanosecond by default
-    // TODO set value after getting database precision
-//    if (pToken) {
-//      char    unit = 0;
-//      int32_t ret = parseAbsoluteDuration(pToken->z, pToken->n, &pSqlExpr->value.i64, &unit, TSDB_TIME_PRECISION_NANO);
-//      if (ret != TSDB_CODE_SUCCESS) {
-//        terrno = TSDB_CODE_TSC_SQL_SYNTAX_ERROR;
-//      }
-//    }
-
-//    pSqlExpr->flags |= 1 << EXPR_FLAG_NS_TIMESTAMP;
-//    pSqlExpr->flags |= 1 << EXPR_FLAG_TIMESTAMP_VAR;
-//    pSqlExpr->value.nType = TSDB_DATA_TYPE_BIGINT;
-    pSqlExpr->tokenId = TK_TIMESTAMP;
+  } else if (optrType == TK_NOW || optrType == TK_VARIABLE) {
+    pSqlExpr->tokenId = optrType;  // TK_TIMESTAMP used to denote this is a timestamp value
     pSqlExpr->type = SQL_NODE_VALUE;
   } else {
     // Here it must be the column name (tk_id) if it is not a number or string.
@@ -269,87 +198,7 @@ tSqlExpr *tSqlExprCreate(tSqlExpr *pLeft, tSqlExpr *pRight, int32_t optrType) {
     pExpr->exprToken.type = pLeft->exprToken.type;
   }
 
-  if ((pLeft != NULL && pRight != NULL) &&
-      (optrType == TK_PLUS || optrType == TK_MINUS || optrType == TK_STAR || optrType == TK_DIVIDE || optrType == TK_REM)) {
-    /*
-     * if a exprToken is noted as the TK_TIMESTAMP, the time precision is microsecond
-     * Otherwise, the time precision is adaptive, determined by the time precision from databases.
-     */
-    if ((pLeft->tokenId == TK_INTEGER && pRight->tokenId == TK_INTEGER) ||
-        (pLeft->tokenId == TK_TIMESTAMP && pRight->tokenId == TK_TIMESTAMP)) {
-      pExpr->value.nType = TSDB_DATA_TYPE_BIGINT;
-      pExpr->tokenId = pLeft->tokenId;
-      pExpr->type    = SQL_NODE_VALUE;
-
-      switch (optrType) {
-        case TK_PLUS: {
-          pExpr->value.i64 = pLeft->value.i64 + pRight->value.i64;
-          break;
-        }
-        case TK_MINUS: {
-          pExpr->value.i64 = pLeft->value.i64 - pRight->value.i64;
-          break;
-        }
-        case TK_STAR: {
-          pExpr->value.i64 = pLeft->value.i64 * pRight->value.i64;
-          break;
-        }
-        case TK_DIVIDE: {
-          pExpr->tokenId = TK_FLOAT;
-          pExpr->value.nType = TSDB_DATA_TYPE_DOUBLE;
-          pExpr->value.d = (double)pLeft->value.i64 / pRight->value.i64;
-          break;
-        }
-        case TK_REM: {
-          pExpr->value.i64 = pLeft->value.i64 % pRight->value.i64;
-          break;
-        }
-      }
-
-      tSqlExprDestroy(pLeft);
-      tSqlExprDestroy(pRight);
-    } else if ((pLeft->tokenId == TK_FLOAT && pRight->tokenId == TK_INTEGER) ||
-               (pLeft->tokenId == TK_INTEGER && pRight->tokenId == TK_FLOAT) ||
-               (pLeft->tokenId == TK_FLOAT && pRight->tokenId == TK_FLOAT)) {
-      pExpr->value.nType = TSDB_DATA_TYPE_DOUBLE;
-      pExpr->tokenId  = TK_FLOAT;
-      pExpr->type     = SQL_NODE_VALUE;
-
-      double left  = (pLeft->value.nType == TSDB_DATA_TYPE_DOUBLE) ? pLeft->value.d : pLeft->value.i64;
-      double right = (pRight->value.nType == TSDB_DATA_TYPE_DOUBLE) ? pRight->value.d : pRight->value.i64;
-
-      switch (optrType) {
-        case TK_PLUS: {
-          pExpr->value.d = left + right;
-          break;
-        }
-        case TK_MINUS: {
-          pExpr->value.d = left - right;
-          break;
-        }
-        case TK_STAR: {
-          pExpr->value.d = left * right;
-          break;
-        }
-        case TK_DIVIDE: {
-          pExpr->value.d = left / right;
-          break;
-        }
-        case TK_REM: {
-          pExpr->value.d = left - ((int64_t)(left / right)) * right;
-          break;
-        }
-      }
-
-      tSqlExprDestroy(pLeft);
-      tSqlExprDestroy(pRight);
-
-    } else {
-      pExpr->tokenId = optrType;
-      pExpr->pLeft = pLeft;
-      pExpr->pRight = pRight;
-    }
-  } else if (optrType == TK_IN) {
+  if (optrType == TK_IN) {
     pExpr->tokenId = optrType;
     pExpr->pLeft = pLeft;
 
@@ -501,6 +350,105 @@ void tSqlExprListDestroy(SArray *pList) {
   taosArrayDestroyEx(pList, freeExprElem);
 }
 
+void tSqlExprEvaluate(tSqlExpr* pExpr) {
+  tSqlExpr *pLeft = pExpr->pLeft;
+  tSqlExpr *pRight = pExpr->pRight;
+
+  if (pLeft == NULL || pRight == NULL) {
+    return;
+  }
+
+  int32_t optrType = pExpr->tokenId;
+
+  if ((optrType == TK_PLUS || optrType == TK_MINUS || optrType == TK_STAR || optrType == TK_DIVIDE ||
+       optrType == TK_REM)) {
+    /*
+     * if a exprToken is noted as the TK_TIMESTAMP, the time precision is microsecond
+     * Otherwise, the time precision is adaptive, determined by the time precision from databases.
+     */
+    int32_t ltoken = pLeft->tokenId;
+    int32_t rtoken = pRight->tokenId;
+
+    if ((ltoken == TK_INTEGER && rtoken == TK_INTEGER) || (ltoken == TK_TIMESTAMP && rtoken == TK_TIMESTAMP)) {
+      pExpr->value.nType = TSDB_DATA_TYPE_BIGINT;
+      pExpr->tokenId = ltoken;
+      pExpr->type = SQL_NODE_VALUE;
+
+      switch (optrType) {
+        case TK_PLUS: {
+          pExpr->value.i64 = pLeft->value.i64 + pRight->value.i64;
+          break;
+        }
+        case TK_MINUS: {
+          pExpr->value.i64 = pLeft->value.i64 - pRight->value.i64;
+          break;
+        }
+        case TK_STAR: {
+          pExpr->value.i64 = pLeft->value.i64 * pRight->value.i64;
+          break;
+        }
+        case TK_DIVIDE: {
+          pExpr->tokenId = TK_FLOAT;
+          pExpr->value.nType = TSDB_DATA_TYPE_DOUBLE;
+          pExpr->value.d = (double)pLeft->value.i64 / pRight->value.i64;
+          break;
+        }
+        case TK_REM: {
+          pExpr->value.i64 = pLeft->value.i64 % pRight->value.i64;
+          break;
+        }
+        default:
+          assert(0);
+      }
+
+      tSqlExprDestroy(pLeft);
+      tSqlExprDestroy(pRight);
+
+      pExpr->pLeft  = NULL;
+      pExpr->pRight = NULL;
+    } else if ((ltoken == TK_FLOAT && rtoken == TK_INTEGER) || (ltoken == TK_INTEGER && rtoken == TK_FLOAT) ||
+               (ltoken == TK_FLOAT && rtoken == TK_FLOAT)) {
+      pExpr->value.nType = TSDB_DATA_TYPE_DOUBLE;
+      pExpr->tokenId = TK_FLOAT;
+      pExpr->type = SQL_NODE_VALUE;
+
+      double left  = (pLeft->value.nType  == TSDB_DATA_TYPE_DOUBLE) ? pLeft->value.d : pLeft->value.i64;
+      double right = (pRight->value.nType == TSDB_DATA_TYPE_DOUBLE) ? pRight->value.d : pRight->value.i64;
+
+      switch (optrType) {
+        case TK_PLUS: {
+          pExpr->value.d = left + right;
+          break;
+        }
+        case TK_MINUS: {
+          pExpr->value.d = left - right;
+          break;
+        }
+        case TK_STAR: {
+          pExpr->value.d = left * right;
+          break;
+        }
+        case TK_DIVIDE: {
+          pExpr->value.d = left / right;
+          break;
+        }
+        case TK_REM: {
+          pExpr->value.d = left - ((int64_t)(left / right)) * right;
+          break;
+        }
+        default:
+          assert(0);
+      }
+
+      tSqlExprDestroy(pLeft);
+      tSqlExprDestroy(pRight);
+
+      pExpr->pLeft  = NULL;
+      pExpr->pRight = NULL;
+    }
+  }
+}
+
 SSqlNode *tSetQuerySqlNode(SToken *pSelectToken, SArray *pSelNodeList, SRelationInfo *pFrom, tSqlExpr *pWhere,
                            SArray *pGroupby, SArray *pSortOrder, SIntervalVal *pInterval,
                            SSessionWindowVal *pSession, SWindowStateVal *pWindowStateVal, SToken *pSliding, SArray *pFill, SLimit *pLimit,
diff --git a/source/libs/parser/src/astValidate.c b/source/libs/parser/src/astValidate.c
index 3b3e80c00f3aedb2e2b8e6db398139da61aef025..132fcd6801825c5e136908583cdd01bbc764e0b6 100644
--- a/source/libs/parser/src/astValidate.c
+++ b/source/libs/parser/src/astValidate.c
@@ -13,13 +13,82 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include "ttime.h"
 #include "parserInt.h"
 #include "parserUtil.h"
-#include "tmsgtype.h"
 
-static int32_t setInvalidOperatorErrMsg(char* dst, int32_t dstBufLen, const char* msg) {
-  strncpy(dst, msg, dstBufLen);
-  return TSDB_CODE_TSC_INVALID_OPERATION;
+static int32_t evaluateImpl(tSqlExpr* pExpr, int32_t tsPrecision) {
+  int32_t code = 0;
+  if (pExpr->type == SQL_NODE_EXPR) {
+    code = evaluateImpl(pExpr->pLeft, tsPrecision);
+    if (code != TSDB_CODE_SUCCESS) {
+      return code;
+    }
+
+    code = evaluateImpl(pExpr->pRight, tsPrecision);
+    if (code != TSDB_CODE_SUCCESS) {
+      return code;
+    }
+
+    if (pExpr->pLeft->type == SQL_NODE_VALUE && pExpr->pRight->type == SQL_NODE_VALUE) {
+      tSqlExpr* pLeft  = pExpr->pLeft;
+      tSqlExpr* pRight = pExpr->pRight;
+      if ((pLeft->tokenId == TK_TIMESTAMP && (pRight->tokenId == TK_INTEGER || pRight->tokenId == TK_FLOAT)) ||
+          ((pRight->tokenId == TK_TIMESTAMP && (pLeft->tokenId == TK_INTEGER || pLeft->tokenId == TK_FLOAT)))) {
+        return TSDB_CODE_TSC_SQL_SYNTAX_ERROR;
+      } else if (pLeft->tokenId == TK_TIMESTAMP && pRight->tokenId == TK_TIMESTAMP) {
+        tSqlExprEvaluate(pExpr);
+      } else {
+        tSqlExprEvaluate(pExpr);
+      }
+    } else {
+      // Other types of expressions are not evaluated, they will be handled during the validation of the abstract syntax tree.
+    }
+  } else if (pExpr->type == SQL_NODE_VALUE) {
+    if (pExpr->tokenId == TK_NOW) {
+      pExpr->value.i64   = taosGetTimestamp(tsPrecision);
+      pExpr->value.nType = TSDB_DATA_TYPE_BIGINT;
+      pExpr->tokenId     = TK_TIMESTAMP;
+    } else if (pExpr->tokenId == TK_VARIABLE) {
+      char    unit = 0;
+      SToken* pToken = &pExpr->exprToken;
+      int32_t ret = parseAbsoluteDuration(pToken->z, pToken->n, &pExpr->value.i64, &unit, tsPrecision);
+      if (ret != TSDB_CODE_SUCCESS) {
+        return TSDB_CODE_TSC_SQL_SYNTAX_ERROR;
+      }
+
+      pExpr->value.nType = TSDB_DATA_TYPE_BIGINT;
+      pExpr->tokenId = TK_TIMESTAMP;
+    }  else if (pExpr->tokenId == TK_NULL) {
+      pExpr->value.nType = TSDB_DATA_TYPE_NULL;
+    } else if (pExpr->tokenId == TK_INTEGER || pExpr->tokenId == TK_STRING || pExpr->tokenId == TK_FLOAT || pExpr->tokenId == TK_BOOL) {
+      SToken* pToken = &pExpr->exprToken;
+
+      int32_t tokenType = pToken->type;
+      toTSDBType(tokenType);
+      taosVariantCreate(&pExpr->value, pToken->z, pToken->n, tokenType);
+    }
+
+    return  TSDB_CODE_SUCCESS;
+    // other types of data are handled in the parent level.
+  }
+
+  return  TSDB_CODE_SUCCESS;
+}
+
+int32_t evaluateSqlNode(SSqlNode* pNode, int32_t tsPrecision, char* msg, int32_t msgBufLen) {
+  assert(pNode != NULL && msg != NULL && msgBufLen > 0);
+  if (pNode->pWhere == NULL) {
+    return TSDB_CODE_SUCCESS;
+  }
+
+  int32_t code = evaluateImpl(pNode->pWhere, tsPrecision);
+  if (code != TSDB_CODE_SUCCESS) {
+    strncpy(msg, "invalid time expression in sql", msgBufLen);
+    return code;
+  }
+
+  return code;
 }
 
 int32_t qParserValidateSqlNode(struct SCatalog* pCatalog, SSqlInfo* pInfo, SQueryStmtInfo* pQueryInfo, int64_t id, char* msgBuf, int32_t msgBufLen) {
@@ -37,15 +106,15 @@ int32_t qParserValidateSqlNode(struct SCatalog* pCatalog, SSqlInfo* pInfo, SQuer
       const char* msg2 = "invalid name";
 
       SToken* pzName = taosArrayGet(pInfo->pMiscInfo->a, 0);
-      if ((pInfo->type != TSDB_SQL_DROP_DNODE) && (parserValidateNameToken(pzName) != TSDB_CODE_SUCCESS)) {
-        return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg2);
+      if ((pInfo->type != TSDB_SQL_DROP_DNODE) && (parserValidateIdToken(pzName) != TSDB_CODE_SUCCESS)) {
+        return setInvalidOperatorMsg(msgBuf, msgBufLen, msg2);
       }
 
       if (pInfo->type == TSDB_SQL_DROP_DB) {
         assert(taosArrayGetSize(pInfo->pMiscInfo->a) == 1);
         code = tNameSetDbName(&pTableMetaInfo->name, getAccountId(pSql), pzName);
         if (code != TSDB_CODE_SUCCESS) {
-          return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg2);
+          return setInvalidOperatorMsg(msgBuf, msgBufLen, msg2);
         }
 
       } else if (pInfo->type == TSDB_SQL_DROP_TABLE) {
@@ -62,7 +131,7 @@ int32_t qParserValidateSqlNode(struct SCatalog* pCatalog, SSqlInfo* pInfo, SQuer
         strncpy(pCmd->payload, pzName->z, pzName->n);
       } else {  // drop user/account
         if (pzName->n >= TSDB_USER_LEN) {
-          return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg3);
+          return setInvalidOperatorMsg(msgBuf, msgBufLen, msg3);
         }
 
         strncpy(pCmd->payload, pzName->z, pzName->n);
@@ -76,12 +145,12 @@ int32_t qParserValidateSqlNode(struct SCatalog* pCatalog, SSqlInfo* pInfo, SQuer
       SToken* pToken = taosArrayGet(pInfo->pMiscInfo->a, 0);
 
       if (tscValidateName(pToken) != TSDB_CODE_SUCCESS) {
-        return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg);
+        return setInvalidOperatorMsg(msgBuf, msgBufLen, msg);
       }
 
       int32_t ret = tNameSetDbName(&pTableMetaInfo->name, getAccountId(pSql), pToken);
       if (ret != TSDB_CODE_SUCCESS) {
-        return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg);
+        return setInvalidOperatorMsg(msgBuf, msgBufLen, msg);
       }
 
       break;
@@ -116,19 +185,19 @@ int32_t qParserValidateSqlNode(struct SCatalog* pCatalog, SSqlInfo* pInfo, SQuer
 
       SCreateDbInfo* pCreateDB = &(pInfo->pMiscInfo->dbOpt);
       if (pCreateDB->dbname.n >= TSDB_DB_NAME_LEN) {
-        return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg2);
+        return setInvalidOperatorMsg(msgBuf, msgBufLen, msg2);
       }
 
       char buf[TSDB_DB_NAME_LEN] = {0};
       SToken token = taosTokenDup(&pCreateDB->dbname, buf, tListLen(buf));
 
       if (tscValidateName(&token) != TSDB_CODE_SUCCESS) {
-        return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg1);
+        return setInvalidOperatorMsg(msgBuf, msgBufLen, msg1);
       }
 
       int32_t ret = tNameSetDbName(&pTableMetaInfo->name, getAccountId(pSql), &token);
       if (ret != TSDB_CODE_SUCCESS) {
-        return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg2);
+        return setInvalidOperatorMsg(msgBuf, msgBufLen, msg2);
       }
 
       if (parseCreateDBOptions(pCmd, pCreateDB) != TSDB_CODE_SUCCESS) {
@@ -142,7 +211,7 @@ int32_t qParserValidateSqlNode(struct SCatalog* pCatalog, SSqlInfo* pInfo, SQuer
       const char* msg = "invalid host name (ip address)";
 
       if (taosArrayGetSize(pInfo->pMiscInfo->a) > 1) {
-        return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg);
+        return setInvalidOperatorMsg(msgBuf, msgBufLen, msg);
       }
 
       SToken* id = taosArrayGet(pInfo->pMiscInfo->a, 0);
@@ -166,11 +235,11 @@ int32_t qParserValidateSqlNode(struct SCatalog* pCatalog, SSqlInfo* pInfo, SQuer
       }
 
       if (pName->n >= TSDB_USER_LEN) {
-        return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg3);
+        return setInvalidOperatorMsg(msgBuf, msgBufLen, msg3);
       }
 
       if (tscValidateName(pName) != TSDB_CODE_SUCCESS) {
-        return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg2);
+        return setInvalidOperatorMsg(msgBuf, msgBufLen, msg2);
       }
 
       SCreateAcctInfo* pAcctOpt = &pInfo->pMiscInfo->acctOpt;
@@ -180,7 +249,7 @@ int32_t qParserValidateSqlNode(struct SCatalog* pCatalog, SSqlInfo* pInfo, SQuer
         } else if (strncmp(pAcctOpt->stat.z, "all", 3) == 0 && pAcctOpt->stat.n == 3) {
         } else if (strncmp(pAcctOpt->stat.z, "no", 2) == 0 && pAcctOpt->stat.n == 2) {
         } else {
-          return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg1);
+          return setInvalidOperatorMsg(msgBuf, msgBufLen, msg1);
         }
       }
 
@@ -192,7 +261,7 @@ int32_t qParserValidateSqlNode(struct SCatalog* pCatalog, SSqlInfo* pInfo, SQuer
 
       SToken* pToken = taosArrayGet(pInfo->pMiscInfo->a, 0);
       if (tscValidateName(pToken) != TSDB_CODE_SUCCESS) {
-        return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg1);
+        return setInvalidOperatorMsg(msgBuf, msgBufLen, msg1);
       }
       // additional msg has been attached already
       code = tscSetTableFullName(&pTableMetaInfo->name, pToken, pSql);
@@ -208,7 +277,7 @@ int32_t qParserValidateSqlNode(struct SCatalog* pCatalog, SSqlInfo* pInfo, SQuer
 
       SToken* pToken = taosArrayGet(pInfo->pMiscInfo->a, 0);
       if (tscValidateName(pToken) != TSDB_CODE_SUCCESS) {
-        return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg1);
+        return setInvalidOperatorMsg(msgBuf, msgBufLen, msg1);
       }
 
       code = tscSetTableFullName(&pTableMetaInfo->name, pToken, pSql);
@@ -223,11 +292,11 @@ int32_t qParserValidateSqlNode(struct SCatalog* pCatalog, SSqlInfo* pInfo, SQuer
 
       SToken* pToken = taosArrayGet(pInfo->pMiscInfo->a, 0);
       if (tscValidateName(pToken) != TSDB_CODE_SUCCESS) {
-        return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg1);
+        return setInvalidOperatorMsg(msgBuf, msgBufLen, msg1);
       }
 
       if (pToken->n > TSDB_DB_NAME_LEN) {
-        return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg1);
+        return setInvalidOperatorMsg(msgBuf, msgBufLen, msg1);
       }
       return tNameSetDbName(&pTableMetaInfo->name, getAccountId(pSql), pToken);
     }
@@ -240,7 +309,7 @@ int32_t qParserValidateSqlNode(struct SCatalog* pCatalog, SSqlInfo* pInfo, SQuer
 
       /* validate the parameter names and options */
       if (validateDNodeConfig(pMiscInfo) != TSDB_CODE_SUCCESS) {
-        return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg2);
+        return setInvalidOperatorMsg(msgBuf, msgBufLen, msg2);
       }
 
       char* pMsg = pCmd->payload;
@@ -254,7 +323,7 @@ int32_t qParserValidateSqlNode(struct SCatalog* pCatalog, SSqlInfo* pInfo, SQuer
       strncpy(pCfg->ep, t0->z, t0->n);
 
       if (validateEp(pCfg->ep) != TSDB_CODE_SUCCESS) {
-        return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg3);
+        return setInvalidOperatorMsg(msgBuf, msgBufLen, msg3);
       }
 
       strncpy(pCfg->config, t1->z, t1->n);
@@ -283,11 +352,11 @@ int32_t qParserValidateSqlNode(struct SCatalog* pCatalog, SSqlInfo* pInfo, SQuer
       SToken* pPwd = &pUser->passwd;
 
       if (pName->n >= TSDB_USER_LEN) {
-        return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg3);
+        return setInvalidOperatorMsg(msgBuf, msgBufLen, msg3);
       }
 
       if (tscValidateName(pName) != TSDB_CODE_SUCCESS) {
-        return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg2);
+        return setInvalidOperatorMsg(msgBuf, msgBufLen, msg2);
       }
 
       if (pCmd->command == TSDB_SQL_CREATE_USER) {
@@ -311,10 +380,10 @@ int32_t qParserValidateSqlNode(struct SCatalog* pCatalog, SSqlInfo* pInfo, SQuer
           } else if (strncasecmp(pPrivilege->z, "write", 5) == 0 && pPrivilege->n == 5) {
             pCmd->count = 3;
           } else {
-            return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg5);
+            return setInvalidOperatorMsg(msgBuf, msgBufLen, msg5);
           }
         } else {
-          return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg7);
+          return setInvalidOperatorMsg(msgBuf, msgBufLen, msg7);
         }
       }
 
@@ -327,7 +396,7 @@ int32_t qParserValidateSqlNode(struct SCatalog* pCatalog, SSqlInfo* pInfo, SQuer
 
       // validate the parameter names and options
       if (validateLocalConfig(pMiscInfo) != TSDB_CODE_SUCCESS) {
-        return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg);
+        return setInvalidOperatorMsg(msgBuf, msgBufLen, msg);
       }
 
       int32_t numOfToken = (int32_t) taosArrayGetSize(pMiscInfo->a);
@@ -382,7 +451,7 @@ int32_t qParserValidateSqlNode(struct SCatalog* pCatalog, SSqlInfo* pInfo, SQuer
         tscTrace("0x%"PRIx64" start to parse the %dth subclause, total:%"PRIzu, pSql->self, i, size);
 
         if (size > 1 && pSqlNode->from && pSqlNode->from->type == SQL_NODE_FROM_SUBQUERY) {
-          return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg1);
+          return setInvalidOperatorMsg(msgBuf, msgBufLen, msg1);
         }
 
 //        normalizeSqlNode(pSqlNode); // normalize the column name in each function
@@ -448,19 +517,19 @@ int32_t qParserValidateSqlNode(struct SCatalog* pCatalog, SSqlInfo* pInfo, SQuer
       assert(taosArrayGetSize(pInfo->pMiscInfo->a) == 1);
       code = tNameSetDbName(&pTableMetaInfo->name, getAccountId(pSql), pzName);
       if (code != TSDB_CODE_SUCCESS) {
-        return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg1);
+        return setInvalidOperatorMsg(msgBuf, msgBufLen, msg1);
       }
       break;
     }
     case TSDB_SQL_COMPACT_VNODE:{
       const char* msg = "invalid compact";
       if (setCompactVnodeInfo(pSql, pInfo) != TSDB_CODE_SUCCESS) {
-        return setInvalidOperatorErrMsg(msgBuf, msgBufLen, msg);
+        return setInvalidOperatorMsg(msgBuf, msgBufLen, msg);
       }
       break;
     }
     default:
-      return setInvalidOperatorErrMsg(msgBuf, msgBufLen, "not support sql expression");
+      return setInvalidOperatorMsg(msgBuf, msgBufLen, "not support sql expression");
   }
 #endif
 
diff --git a/source/libs/parser/src/parser.c b/source/libs/parser/src/parser.c
index d7f9fca226392eec02ed182bf3f110e61bc4ebf1..9709c5ad6559bdfae7de5e3ddf2c2cf04f1ae42c 100644
--- a/source/libs/parser/src/parser.c
+++ b/source/libs/parser/src/parser.c
@@ -16,6 +16,7 @@
 #include "parserInt.h"
 #include "ttoken.h"
 #include "astGenerator.h"
+#include "parserUtil.h"
 
 bool qIsInsertSql(const char* pStr, size_t length) {
   return false;
@@ -50,6 +51,216 @@ int32_t qParserConvertSql(const char* pStr, size_t length, char** pConvertSql) {
   return 0;
 }
 
-int32_t qParserExtractRequestedMetaInfo(const SArray* pSqlNodeList, SMetaReq* pMetaInfo) {
-  return 0;
+static int32_t getTableNameFromSubquery(SSqlNode* pSqlNode, SArray* tableNameList, char* msgBuf) {
+  int32_t numOfSub = (int32_t)taosArrayGetSize(pSqlNode->from->list);
+
+  for (int32_t j = 0; j < numOfSub; ++j) {
+    SRelElementPair* sub = taosArrayGet(pSqlNode->from->list, j);
+
+    int32_t num = (int32_t)taosArrayGetSize(sub->pSubquery);
+    for (int32_t i = 0; i < num; ++i) {
+      SSqlNode* p = taosArrayGetP(sub->pSubquery, i);
+      if (p->from->type == SQL_NODE_FROM_TABLELIST) {
+        int32_t code = getTableNameFromSqlNode(p, tableNameList, msgBuf);
+        if (code != TSDB_CODE_SUCCESS) {
+          return code;
+        }
+      } else {
+        getTableNameFromSubquery(p, tableNameList, msgBuf);
+      }
+    }
+  }
+
+  return TSDB_CODE_SUCCESS;
+}
+
+static int32_t getTableNameFromSqlNode(SSqlNode* pSqlNode, SArray* tableNameList, char* msg, int32_t msgBufLen) {
+  const char* msg1 = "invalid table name";
+
+  int32_t numOfTables = (int32_t) taosArrayGetSize(pSqlNode->from->list);
+  assert(pSqlNode->from->type == SQL_NODE_FROM_TABLELIST);
+
+  for(int32_t j = 0; j < numOfTables; ++j) {
+    SRelElementPair* item = taosArrayGet(pSqlNode->from->list, j);
+
+    SToken* t = &item->tableName;
+    if (t->type == TK_INTEGER || t->type == TK_FLOAT) {
+      return parserSetInvalidOperatorMsg(msg, msgBufLen, msg1);
+    }
+
+    tscDequoteAndTrimToken(t);
+    if (parserValidateIdToken(t) != TSDB_CODE_SUCCESS) {
+      return parserSetInvalidOperatorMsg(msg, msgBufLen, msg1);
+    }
+
+    SName name = {0};
+    int32_t code = tscSetTableFullName(&name, t, pSql);
+    if (code != TSDB_CODE_SUCCESS) {
+      return code;
+    }
+
+    taosArrayPush(tableNameList, &name);
+  }
+
+  return TSDB_CODE_SUCCESS;
+}
+
+int32_t qParserExtractRequestedMetaInfo(const SArray* pSqlNodeList, SMetaReq* pMetaInfo, char* msg, int32_t msgBufLen) {
+  int32_t code = TSDB_CODE_SUCCESS;
+
+  SArray* tableNameList = NULL;
+  SArray* pVgroupList   = NULL;
+  SArray* plist         = NULL;
+  STableMeta* pTableMeta = NULL;
+//  size_t    tableMetaCapacity = 0;
+//  SQueryInfo* pQueryInfo = tscGetQueryInfo(pCmd);
+
+//  pCmd->pTableMetaMap = taosHashInit(4, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BINARY), false, HASH_NO_LOCK);
+
+  tableNameList = taosArrayInit(4, sizeof(SName));
+  size_t size = taosArrayGetSize(pSqlNodeList);
+  for (int32_t i = 0; i < size; ++i) {
+    SSqlNode* pSqlNode = taosArrayGetP(pSqlNodeList, i);
+    if (pSqlNode->from == NULL) {
+      goto _end;
+    }
+
+    // load the table meta in the from clause
+    if (pSqlNode->from->type == SQL_NODE_FROM_TABLELIST) {
+      code = getTableNameFromSqlNode(pSqlNode, tableNameList, msg, msgBufLen);
+      if (code != TSDB_CODE_SUCCESS) {
+        goto _end;
+      }
+    } else {
+      code = getTableNameFromSubquery(pSqlNode, tableNameList, msg, msgBufLen);
+      if (code != TSDB_CODE_SUCCESS) {
+        goto _end;
+      }
+    }
+  }
+
+  char name[TSDB_TABLE_FNAME_LEN] = {0};
+
+  plist = taosArrayInit(4, POINTER_BYTES);
+  pVgroupList = taosArrayInit(4, POINTER_BYTES);
+
+  taosArraySort(tableNameList, tnameComparFn);
+  taosArrayRemoveDuplicate(tableNameList, tnameComparFn, NULL);
+
+  STableMeta* pSTMeta = (STableMeta *)(pSql->pBuf);
+  size_t numOfTables = taosArrayGetSize(tableNameList);
+  for (int32_t i = 0; i < numOfTables; ++i) {
+    SName* pname = taosArrayGet(tableNameList, i);
+    tNameExtractFullName(pname, name);
+
+    size_t len = strlen(name);
+
+    if (NULL == taosHashGetCloneExt(tscTableMetaMap, name, len, NULL,  (void **)&pTableMeta, &tableMetaCapacity)) {
+      // not found
+      tfree(pTableMeta);
+    }
+
+    if (pTableMeta && pTableMeta->id.uid > 0) {
+      tscDebug("0x%"PRIx64" retrieve table meta %s from local buf", pSql->self, name);
+
+      // avoid mem leak, may should update pTableMeta
+      void* pVgroupIdList = NULL;
+      if (pTableMeta->tableType == TSDB_CHILD_TABLE) {
+        code = tscCreateTableMetaFromSTableMeta((STableMeta **)(&pTableMeta), name, &tableMetaCapacity, (STableMeta **)(&pSTMeta));
+        pSql->pBuf = (void *)pSTMeta;
+
+        // create the child table meta from super table failed, try load it from mnode
+        if (code != TSDB_CODE_SUCCESS) {
+          char* t = strdup(name);
+          taosArrayPush(plist, &t);
+          continue;
+        }
+      } else if (pTableMeta->tableType == TSDB_SUPER_TABLE) {
+        // the vgroup list of super table is not kept in local buffer, so here need retrieve it from the mnode each time
+        tscDebug("0x%"PRIx64" try to acquire cached super table %s vgroup id list", pSql->self, name);
+        void* pv = taosCacheAcquireByKey(tscVgroupListBuf, name, len);
+        if (pv == NULL) {
+          char* t = strdup(name);
+          taosArrayPush(pVgroupList, &t);
+          tscDebug("0x%"PRIx64" failed to retrieve stable %s vgroup id list in cache, try fetch from mnode", pSql->self, name);
+        } else {
+          tFilePage* pdata = (tFilePage*) pv;
+          pVgroupIdList = taosArrayInit((size_t) pdata->num, sizeof(int32_t));
+          if (pVgroupIdList == NULL) {
+            return TSDB_CODE_TSC_OUT_OF_MEMORY;
+          }
+
+          taosArrayAddBatch(pVgroupIdList, pdata->data, (int32_t) pdata->num);
+          taosCacheRelease(tscVgroupListBuf, &pv, false);
+        }
+      }
+
+      if (taosHashGet(pCmd->pTableMetaMap, name, len) == NULL) {
+        STableMeta* pMeta = tscTableMetaDup(pTableMeta);
+        STableMetaVgroupInfo tvi = { .pTableMeta = pMeta,  .vgroupIdList = pVgroupIdList};
+        taosHashPut(pCmd->pTableMetaMap, name, len, &tvi, sizeof(STableMetaVgroupInfo));
+      }
+    } else {
+      // Add to the retrieve table meta array list.
+      // If the tableMeta is missing, the cached vgroup list for the corresponding super table will be ignored.
+      tscDebug("0x%"PRIx64" failed to retrieve table meta %s from local buf", pSql->self, name);
+
+      char* t = strdup(name);
+      taosArrayPush(plist, &t);
+    }
+  }
+
+  size_t funcSize = 0;
+  if (pInfo->funcs) {
+    funcSize = taosArrayGetSize(pInfo->funcs);
+  }
+
+  if (funcSize > 0) {
+    for (size_t i = 0; i < funcSize; ++i) {
+      SToken* t = taosArrayGet(pInfo->funcs, i);
+      if (NULL == t) {
+        continue;
+      }
+
+      if (t->n >= TSDB_FUNC_NAME_LEN) {
+        code = tscSQLSyntaxErrMsg(tscGetErrorMsgPayload(pCmd), "too long function name", t->z);
+        if (code != TSDB_CODE_SUCCESS) {
+          goto _end;
+        }
+      }
+
+      int32_t functionId = isValidFunction(t->z, t->n);
+      if (functionId < 0) {
+        struct SUdfInfo info = {0};
+        info.name = strndup(t->z, t->n);
+        if (pQueryInfo->pUdfInfo == NULL) {
+          pQueryInfo->pUdfInfo = taosArrayInit(4, sizeof(struct SUdfInfo));
+        }
+
+        info.functionId = (int32_t)taosArrayGetSize(pQueryInfo->pUdfInfo) * (-1) - 1;;
+        taosArrayPush(pQueryInfo->pUdfInfo, &info);
+      }
+    }
+  }
+
+  // load the table meta for a given table name list
+  if (taosArrayGetSize(plist) > 0 || taosArrayGetSize(pVgroupList) > 0 || (pQueryInfo->pUdfInfo && taosArrayGetSize(pQueryInfo->pUdfInfo) > 0)) {
+    code = getMultiTableMetaFromMnode(pSql, plist, pVgroupList, pQueryInfo->pUdfInfo, tscTableMetaCallBack, true);
+  }
+
+  _end:
+  if (plist != NULL) {
+    taosArrayDestroyEx(plist, freeElem);
+  }
+
+  if (pVgroupList != NULL) {
+    taosArrayDestroyEx(pVgroupList, freeElem);
+  }
+
+  if (tableNameList != NULL) {
+    taosArrayDestroy(tableNameList);
+  }
+
+  tfree(pTableMeta);
+  return code;
 }
\ No newline at end of file
diff --git a/source/libs/parser/src/parserUtil.c b/source/libs/parser/src/parserUtil.c
index 77b8e9e789cc6d155314e83b9ac0bdfca97f53b9..420306e97001daa1131cbc5bcbaeb5e7e9f3b283 100644
--- a/source/libs/parser/src/parserUtil.c
+++ b/source/libs/parser/src/parserUtil.c
@@ -2,7 +2,7 @@
 #include "taoserror.h"
 #include "tutil.h"
 
-int32_t parserValidateNameToken(SToken* pToken) {
+int32_t parserValidateIdToken(SToken* pToken) {
   if (pToken == NULL || pToken->z == NULL || pToken->type != TK_ID) {
     return TSDB_CODE_TSC_INVALID_OPERATION;
   }
@@ -57,4 +57,9 @@ int32_t parserValidateNameToken(SToken* pToken) {
   }
 
   return TSDB_CODE_SUCCESS;
+}
+
+int32_t parserSetInvalidOperatorMsg(char* dst, int32_t dstBufLen, const char* msg) {
+  strncpy(dst, msg, dstBufLen);
+  return TSDB_CODE_TSC_INVALID_OPERATION;
 }
\ No newline at end of file
diff --git a/source/libs/parser/src/ttokenizer.c b/source/libs/parser/src/ttokenizer.c
index 5e3cefea10386fb5ba09047182c8abe824b49d81..b71fb4538e514eb67702d7a5f1e829d87a07f7a6 100644
--- a/source/libs/parser/src/ttokenizer.c
+++ b/source/libs/parser/src/ttokenizer.c
@@ -411,6 +411,7 @@ uint32_t tGetToken(char* z, uint32_t* tokenId) {
       *tokenId = TK_QUESTION;
       return 1;
     }
+    case '`':
     case '\'':
     case '"': {
       int  delim = z[0];
@@ -434,7 +435,7 @@ uint32_t tGetToken(char* z, uint32_t* tokenId) {
       if (z[i]) i++;
 
       if (strEnd) {
-        *tokenId = TK_STRING;
+        *tokenId = (delim == '`')? TK_ID:TK_STRING;
         return i;
       }
 
diff --git a/source/libs/parser/test/tokenizerTest.cpp b/source/libs/parser/test/tokenizerTest.cpp
index 2a3bdbed5407b35e530c4ad353edd749d195eee0..5aca0077f487b2625476105dc651725a10716a41 100644
--- a/source/libs/parser/test/tokenizerTest.cpp
+++ b/source/libs/parser/test/tokenizerTest.cpp
@@ -14,6 +14,7 @@
 #include "ttoken.h"
 #include "astGenerator.h"
 #include "parserUtil.h"
+#include "parserInt.h"
 
 namespace {
 int32_t testValidateName(char* name) {
@@ -23,7 +24,7 @@ int32_t testValidateName(char* name) {
   token.type = 0;
 
   tGetToken(name, &token.type);
-  return parserValidateNameToken(&token);
+  return parserValidateIdToken(&token);
 }
 
 SToken createToken(char* s) {
@@ -667,4 +668,29 @@ TEST(testCase, isValidNumber_test) {
 TEST(testCase, generateAST_test) {
   SSqlInfo info = doGenerateAST("select * from t1 where ts < now");
   ASSERT_EQ(info.valid, true);
-}
\ No newline at end of file
+
+  SSqlInfo info1 = doGenerateAST("select * from `t.1abc` where ts<now+2h  and col < 20+99");
+  ASSERT_EQ(info1.valid, true);
+
+  char msg[128] = {0};
+  SSqlNode* pNode = (SSqlNode*) taosArrayGetP(((SArray*)info1.list), 0);
+  int32_t code = evaluateSqlNode(pNode, TSDB_TIME_PRECISION_NANO, msg, sizeof(msg));
+  ASSERT_EQ(code, 0);
+
+  SSqlInfo info2 = doGenerateAST("select * from abc where ts<now+2");
+  SSqlNode* pNode2 = (SSqlNode*) taosArrayGetP(((SArray*)info2.list), 0);
+  code = evaluateSqlNode(pNode2, TSDB_TIME_PRECISION_MILLI, msg, sizeof(msg));
+  ASSERT_NE(code, 0);
+}
+
+TEST(testCase, evaluateAST_test) {
+  SSqlInfo info1 = doGenerateAST("select a, b+22 from `t.1abc` where ts<now+2h and col < 20 + 99");
+  ASSERT_EQ(info1.valid, true);
+
+  char msg[128] = {0};
+  SSqlNode* pNode = (SSqlNode*) taosArrayGetP(((SArray*)info1.list), 0);
+  int32_t code = evaluateSqlNode(pNode, TSDB_TIME_PRECISION_NANO, msg, sizeof(msg));
+  ASSERT_EQ(code, 0);
+
+
+}