diff --git a/source/common/src/versionUtil.c b/source/common/src/versionUtil.c
new file mode 100644
index 0000000000000000000000000000000000000000..22c50fa5cf5cab0a4c94e09cf38f600909d9bf63
--- /dev/null
+++ b/source/common/src/versionUtil.c
@@ -0,0 +1,63 @@
+#include "os.h"
+#include "tdef.h"
+#include "ulog.h"
+#include "taoserror.h"
+
+bool taosGetVersionNumber(char *versionStr, int *versionNubmer) {
+  if (versionStr == NULL || versionNubmer == NULL) {
+    return false;
+  }
+
+  int versionNumberPos[5] = {0};
+  int len = (int)strlen(versionStr);
+  int dot = 0;
+  for (int pos = 0; pos < len && dot < 4; ++pos) {
+    if (versionStr[pos] == '.') {
+      versionStr[pos] = 0;
+      versionNumberPos[++dot] = pos + 1;
+    }
+  }
+
+  if (dot != 3) {
+    return false;
+  }
+
+  for (int pos = 0; pos < 4; ++pos) {
+    versionNubmer[pos] = atoi(versionStr + versionNumberPos[pos]);
+  }
+  versionStr[versionNumberPos[1] - 1] = '.';
+  versionStr[versionNumberPos[2] - 1] = '.';
+  versionStr[versionNumberPos[3] - 1] = '.';
+
+  return true;
+}
+
+int taosCheckVersion(char *input_client_version, char *input_server_version, int comparedSegments) {
+  char client_version[TSDB_VERSION_LEN] = {0};
+  char server_version[TSDB_VERSION_LEN] = {0};
+  int clientVersionNumber[4] = {0};
+  int serverVersionNumber[4] = {0};
+
+  tstrncpy(client_version, input_client_version, sizeof(client_version));
+  tstrncpy(server_version, input_server_version, sizeof(server_version));
+
+  if (!taosGetVersionNumber(client_version, clientVersionNumber)) {
+    uError("invalid client version:%s", client_version);
+    return TSDB_CODE_TSC_INVALID_VERSION;
+  }
+
+  if (!taosGetVersionNumber(server_version, serverVersionNumber)) {
+    uError("invalid server version:%s", server_version);
+    return TSDB_CODE_TSC_INVALID_VERSION;
+  }
+
+  for(int32_t i = 0; i < comparedSegments; ++i) {
+    if (clientVersionNumber[i] != serverVersionNumber[i]) {
+      uError("the %d-th number of server version:%s not matched with client version:%s", i, server_version,
+             client_version);
+      return TSDB_CODE_TSC_INVALID_VERSION;
+    }
+  }
+
+  return 0;
+}
diff --git a/source/libs/parser/src/parserUtil.c b/source/libs/parser/src/parserUtil.c
new file mode 100644
index 0000000000000000000000000000000000000000..77b8e9e789cc6d155314e83b9ac0bdfca97f53b9
--- /dev/null
+++ b/source/libs/parser/src/parserUtil.c
@@ -0,0 +1,60 @@
+#include "parserUtil.h"
+#include "taoserror.h"
+#include "tutil.h"
+
+int32_t parserValidateNameToken(SToken* pToken) {
+  if (pToken == NULL || pToken->z == NULL || pToken->type != TK_ID) {
+    return TSDB_CODE_TSC_INVALID_OPERATION;
+  }
+
+  char* sep = strnchr(pToken->z, TS_PATH_DELIMITER[0], pToken->n, true);
+  if (sep == NULL) {  // It is a single part token, not a complex type
+    if (isNumber(pToken)) {
+      return TSDB_CODE_TSC_INVALID_OPERATION;
+    }
+
+    strntolower(pToken->z, pToken->z, pToken->n);
+  } else {  // two part
+    int32_t oldLen = pToken->n;
+    char*   pStr = pToken->z;
+
+    if (pToken->type == TK_SPACE) {
+      pToken->n = (uint32_t)strtrim(pToken->z);
+    }
+
+    pToken->n = tGetToken(pToken->z, &pToken->type);
+    if (pToken->z[pToken->n] != TS_PATH_DELIMITER[0]) {
+      return TSDB_CODE_TSC_INVALID_OPERATION;
+    }
+
+    if (pToken->type != TK_ID) {
+      return TSDB_CODE_TSC_INVALID_OPERATION;
+    }
+
+    int32_t firstPartLen = pToken->n;
+
+    pToken->z = sep + 1;
+    pToken->n = (uint32_t)(oldLen - (sep - pStr) - 1);
+    int32_t len = tGetToken(pToken->z, &pToken->type);
+    if (len != pToken->n || pToken->type != TK_ID) {
+      return TSDB_CODE_TSC_INVALID_OPERATION;
+    }
+
+    // re-build the whole name string
+    if (pStr[firstPartLen] == TS_PATH_DELIMITER[0]) {
+      // first part do not have quote do nothing
+    } else {
+      pStr[firstPartLen] = TS_PATH_DELIMITER[0];
+      memmove(&pStr[firstPartLen + 1], pToken->z, pToken->n);
+      uint32_t offset = (uint32_t)(pToken->z - (pStr + firstPartLen + 1));
+      memset(pToken->z + pToken->n - offset, ' ', offset);
+    }
+
+    pToken->n += (firstPartLen + sizeof(TS_PATH_DELIMITER[0]));
+    pToken->z = pStr;
+
+    strntolower(pToken->z, pToken->z, pToken->n);
+  }
+
+  return TSDB_CODE_SUCCESS;
+}
\ No newline at end of file
diff --git a/source/libs/parser/test/CMakeLists.txt b/source/libs/parser/test/CMakeLists.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ef40711fcc39fe8951058b4e34a4227d96c3596c
--- /dev/null
+++ b/source/libs/parser/test/CMakeLists.txt
@@ -0,0 +1,27 @@
+
+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(astTest ${SOURCE_LIST})
+TARGET_LINK_LIBRARIES(
+        astTest
+        PUBLIC os util common parser catalog transport gtest
+)
+
+TARGET_INCLUDE_DIRECTORIES(
+        astTest
+        PUBLIC "${CMAKE_SOURCE_DIR}/include/libs/parser/"
+        PRIVATE "${CMAKE_SOURCE_DIR}/source/libs/parser/inc"
+)
+
+#
+#SET_SOURCE_FILES_PROPERTIES(./astTest.cpp PROPERTIES COMPILE_FLAGS -w)
+#SET_SOURCE_FILES_PROPERTIES(./histogramTest.cpp PROPERTIES COMPILE_FLAGS -w)
+#SET_SOURCE_FILES_PROPERTIES(./percentileTest.cpp PROPERTIES COMPILE_FLAGS -w)
+#SET_SOURCE_FILES_PROPERTIES(./resultBufferTest.cpp PROPERTIES COMPILE_FLAGS -w)
+#SET_SOURCE_FILES_PROPERTIES(./tsBufTest.cpp PROPERTIES COMPILE_FLAGS -w)
+#SET_SOURCE_FILES_PROPERTIES(./unitTest.cpp PROPERTIES COMPILE_FLAGS -w)
+#SET_SOURCE_FILES_PROPERTIES(./rangeMergeTest.cpp PROPERTIES COMPILE_FLAGS -w)
diff --git a/source/libs/parser/test/tokenizerTest.cpp b/source/libs/parser/test/tokenizerTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..2a3bdbed5407b35e530c4ad353edd749d195eee0
--- /dev/null
+++ b/source/libs/parser/test/tokenizerTest.cpp
@@ -0,0 +1,670 @@
+#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"
+#include "ttoken.h"
+#include "astGenerator.h"
+#include "parserUtil.h"
+
+namespace {
+int32_t testValidateName(char* name) {
+  SToken token = {0};
+  token.z = name;
+  token.n = strlen(name);
+  token.type = 0;
+
+  tGetToken(name, &token.type);
+  return parserValidateNameToken(&token);
+}
+
+SToken createToken(char* s) {
+  SToken t = {0};
+
+  t.type = TK_STRING;
+  t.z = s;
+  t.n = strlen(s);
+  return t;
+}
+}  // namespace
+
+static void _init_tvariant_bool(SVariant* t) {
+  t->i64 = TSDB_FALSE;
+  t->nType = TSDB_DATA_TYPE_BOOL;
+}
+
+static void _init_tvariant_tinyint(SVariant* t) {
+  t->i64 = -27;
+  t->nType = TSDB_DATA_TYPE_TINYINT;
+}
+
+static void _init_tvariant_int(SVariant* t) {
+  t->i64 = -23997659;
+  t->nType = TSDB_DATA_TYPE_INT;
+}
+
+static void _init_tvariant_bigint(SVariant* t) {
+  t->i64 = -3333333333333;
+  t->nType = TSDB_DATA_TYPE_BIGINT;
+}
+
+static void _init_tvariant_float(SVariant* t) {
+  t->d = -8991212199.8987878776;
+  t->nType = TSDB_DATA_TYPE_FLOAT;
+}
+
+static void _init_tvariant_binary(SVariant* t) {
+  taosVariantDestroy(t);
+
+  t->pz = (char*)calloc(1, 20);  //"2e3");
+  t->nType = TSDB_DATA_TYPE_BINARY;
+  strcpy(t->pz, "2e5");
+  t->nLen = strlen(t->pz);
+}
+
+static void _init_tvariant_nchar(SVariant* t) {
+  taosVariantDestroy(t);
+
+  t->wpz = (wchar_t*)calloc(1, 20 * TSDB_NCHAR_SIZE);
+  t->nType = TSDB_DATA_TYPE_NCHAR;
+  wcscpy(t->wpz, L"-2000000.8765");
+  t->nLen = twcslen(t->wpz);
+}
+
+int main(int argc, char** argv) {
+  testing::InitGoogleTest(&argc, argv);
+  return RUN_ALL_TESTS();
+}
+
+TEST(testCase, validateToken_test) {
+  char t01[] = "abc";
+  EXPECT_EQ(testValidateName(t01), TSDB_CODE_SUCCESS);
+
+  char t02[] = "'abc'";
+  EXPECT_EQ(testValidateName(t02), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t1[] = "abc.def";
+  EXPECT_EQ(testValidateName(t1), TSDB_CODE_SUCCESS);
+  printf("%s\n", t1);
+
+  char t98[] = "abc.DeF";
+  EXPECT_EQ(testValidateName(t98), TSDB_CODE_SUCCESS);
+  EXPECT_STREQ(t98, "abc.def");
+  printf("%s\n", t98);
+
+  char t97[] = "257.abc";
+  EXPECT_EQ(testValidateName(t97), TSDB_CODE_TSC_INVALID_OPERATION);
+  printf("%s\n", t97);
+
+  char t96[] = "_257.aBc";
+  EXPECT_EQ(testValidateName(t96), TSDB_CODE_SUCCESS);
+  EXPECT_STREQ(t96, "_257.abc");
+  printf("%s\n", t96);
+
+  char t99[] = "abc . def";
+  EXPECT_EQ(testValidateName(t99), TSDB_CODE_TSC_INVALID_OPERATION);
+  printf("%s\n", t99);
+
+  char t2[] = "'abc.def'";
+  EXPECT_EQ(testValidateName(t2), TSDB_CODE_TSC_INVALID_OPERATION);
+  printf("%s\n", t2);
+
+  char t3[] = "'abc'.def";
+  EXPECT_EQ(testValidateName(t3), TSDB_CODE_TSC_INVALID_OPERATION);
+  printf("%s\n", t3);
+
+  char t4[] = "'abc'.'def'";
+  EXPECT_EQ(testValidateName(t4), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t5[] = "table.'def'";
+  EXPECT_EQ(testValidateName(t5), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t6[] = "'table'.'def'";
+  EXPECT_EQ(testValidateName(t6), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t7[] = "'_ab1234'.'def'";
+  EXPECT_EQ(testValidateName(t7), TSDB_CODE_TSC_INVALID_OPERATION);
+  printf("%s\n", t7);
+
+  char t8[] = "'_ab&^%1234'.'def'";
+  EXPECT_EQ(testValidateName(t8), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t9[] = "'_123'.'gtest中文'";
+  EXPECT_EQ(testValidateName(t9), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t10[] = "abc.'gtest中文'";
+  EXPECT_EQ(testValidateName(t10), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t10_1[] = "abc.'中文gtest'";
+  EXPECT_EQ(testValidateName(t10_1), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t11[] = "'192.168.0.1'.abc";
+  EXPECT_EQ(testValidateName(t11), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t12[] = "192.168.0.1.abc";
+  EXPECT_EQ(testValidateName(t12), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t13[] = "abc.";
+  EXPECT_EQ(testValidateName(t13), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t14[] = ".abc";
+  EXPECT_EQ(testValidateName(t14), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t15[] = ".'abc'";
+  EXPECT_EQ(testValidateName(t15), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t16[] = ".abc'";
+  EXPECT_EQ(testValidateName(t16), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t17[] = "123a.\"abc\"";
+  EXPECT_EQ(testValidateName(t17), TSDB_CODE_TSC_INVALID_OPERATION);
+  printf("%s\n", t17);
+
+  char t18[] = "a.\"abc\"";
+  EXPECT_EQ(testValidateName(t18), TSDB_CODE_TSC_INVALID_OPERATION);
+  printf("%s\n", t18);
+
+  char t19[] = "'_ab1234'.'def'.'ab123'";
+  EXPECT_EQ(testValidateName(t19), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t20[] = "'_ab1234*&^'";
+  EXPECT_EQ(testValidateName(t20), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t21[] = "'1234_abc'";
+  EXPECT_EQ(testValidateName(t21), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  // =======Containing capital letters=================
+  char t30[] = "ABC";
+  EXPECT_EQ(testValidateName(t30), TSDB_CODE_SUCCESS);
+
+  char t31[] = "'ABC'";
+  EXPECT_EQ(testValidateName(t31), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t32[] = "ABC.def";
+  EXPECT_EQ(testValidateName(t32), TSDB_CODE_SUCCESS);
+
+  char t33[] = "'ABC.def";
+  EXPECT_EQ(testValidateName(t33), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t33_0[] = "abc.DEF'";
+  EXPECT_EQ(testValidateName(t33_0), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t34[] = "'ABC.def'";
+  // int32_t tmp0 = testValidateName(t34);
+  EXPECT_EQ(testValidateName(t34), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t35[] = "'ABC'.def";
+  EXPECT_EQ(testValidateName(t35), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t36[] = "ABC.DEF";
+  EXPECT_EQ(testValidateName(t36), TSDB_CODE_SUCCESS);
+
+  char t37[] = "abc.DEF";
+  EXPECT_EQ(testValidateName(t37), TSDB_CODE_SUCCESS);
+
+  char t37_1[] = "abc._123DEF";
+  EXPECT_EQ(testValidateName(t37_1), TSDB_CODE_SUCCESS);
+
+  char t38[] = "'abc'.\"DEF\"";
+  EXPECT_EQ(testValidateName(t38), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  // do not use key words
+  char t39[] = "table.'DEF'";
+  EXPECT_EQ(testValidateName(t39), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t40[] = "'table'.'DEF'";
+  EXPECT_EQ(testValidateName(t40), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t41[] = "'_abXYZ1234'.'deFF'";
+  EXPECT_EQ(testValidateName(t41), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t42[] = "'_abDEF&^%1234'.'DIef'";
+  EXPECT_EQ(testValidateName(t42), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t43[] = "'_123'.'Gtest中文'";
+  EXPECT_EQ(testValidateName(t43), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t44[] = "'aABC'.'Gtest中文'";
+  EXPECT_EQ(testValidateName(t44), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t45[] = "'ABC'.";
+  EXPECT_EQ(testValidateName(t45), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t46[] = ".'ABC'";
+  EXPECT_EQ(testValidateName(t46), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t47[] = "a.\"aTWc\"";
+  EXPECT_EQ(testValidateName(t47), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  // ================has space =================
+  char t60[] = " ABC ";
+  EXPECT_EQ(testValidateName(t60), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t60_1[] = "   ABC ";
+  EXPECT_EQ(testValidateName(t60_1), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t61[] = "' ABC '";
+  EXPECT_EQ(testValidateName(t61), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t61_1[] = "'  ABC '";
+  EXPECT_EQ(testValidateName(t61_1), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t62[] = " ABC . def ";
+  EXPECT_EQ(testValidateName(t62), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t63[] = "' ABC . def ";
+  EXPECT_EQ(testValidateName(t63), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t63_0[] = "  abc . DEF ' ";
+  EXPECT_EQ(testValidateName(t63_0), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t64[] = " '  ABC .  def ' ";
+  // int32_t tmp1 = testValidateName(t64);
+  EXPECT_EQ(testValidateName(t64), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t65[] = " ' ABC  '. def ";
+  EXPECT_EQ(testValidateName(t65), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t66[] = "' ABC '.'  DEF '";
+  EXPECT_EQ(testValidateName(t66), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t67[] = "abc . '  DEF  '";
+  EXPECT_EQ(testValidateName(t67), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t68[] = "'  abc '.'   DEF '";
+  EXPECT_EQ(testValidateName(t68), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  // do not use key words
+  char t69[] = "table.'DEF'";
+  EXPECT_EQ(testValidateName(t69), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t70[] = "'table'.'DEF'";
+  EXPECT_EQ(testValidateName(t70), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t71[] = "'_abXYZ1234  '.' deFF  '";
+  EXPECT_EQ(testValidateName(t71), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t72[] = "'_abDEF&^%1234'.'  DIef'";
+  EXPECT_EQ(testValidateName(t72), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t73[] = "'_123'.'  Gtest中文'";
+  EXPECT_EQ(testValidateName(t73), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t74[] = "' aABC'.'Gtest中文'";
+  EXPECT_EQ(testValidateName(t74), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t75[] = "' ABC '.";
+  EXPECT_EQ(testValidateName(t75), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t76[] = ".' ABC'";
+  EXPECT_EQ(testValidateName(t76), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t77[] = " a . \"aTWc\" ";
+  EXPECT_EQ(testValidateName(t77), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t78[] = "  a.\"aTWc  \"";
+  EXPECT_EQ(testValidateName(t78), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  // ===============muti string by space ===================
+  // There's no such case.
+  // char t160[] = "A BC";
+  // EXPECT_EQ(testValidateName(t160), TSDB_CODE_TSC_INVALID_OPERATION);
+  // printf("end:%s\n", t160);
+
+  // There's no such case.
+  // char t161[] = "' A BC '";
+  // EXPECT_EQ(testValidateName(t161), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t162[] = " AB C . de f ";
+  EXPECT_EQ(testValidateName(t162), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t163[] = "' AB C . de f ";
+  EXPECT_EQ(testValidateName(t163), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t163_0[] = "  ab c . DE F ' ";
+  EXPECT_EQ(testValidateName(t163_0), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t164[] = " '  AB C .  de f ' ";
+  // int32_t tmp2 = testValidateName(t164);
+  EXPECT_EQ(testValidateName(t164), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t165[] = " ' A BC  '. de f ";
+  EXPECT_EQ(testValidateName(t165), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t166[] = "' AB C '.'  DE  F '";
+  EXPECT_EQ(testValidateName(t166), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t167[] = "ab  c . '  D  EF  '";
+  EXPECT_EQ(testValidateName(t167), TSDB_CODE_TSC_INVALID_OPERATION);
+
+  char t168[] = "'  a bc '.'   DE  F '";
+  EXPECT_EQ(testValidateName(t168), TSDB_CODE_TSC_INVALID_OPERATION);
+}
+
+#if 0
+TEST(testCase, tvariant_convert) {
+  // 1. bool data to all other data types
+  SVariant t = {0};
+  _init_tvariant_bool(&t);
+
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_BOOL), 0);
+  EXPECT_EQ(t.i64, 0);
+
+  _init_tvariant_bool(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_TINYINT), 0);
+  EXPECT_EQ(t.i64, 0);
+
+  _init_tvariant_bool(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_SMALLINT), 0);
+  EXPECT_EQ(t.i64, 0);
+
+  _init_tvariant_bool(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_BIGINT), 0);
+  EXPECT_EQ(t.i64, 0);
+
+  _init_tvariant_bool(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_FLOAT), 0);
+  EXPECT_EQ(t.d, 0);
+
+  _init_tvariant_bool(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_DOUBLE), 0);
+  EXPECT_EQ(t.d, 0);
+
+  _init_tvariant_bool(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_BINARY), 0);
+  EXPECT_STREQ(t.pz, "FALSE");
+  taosVariantDestroy(&t);
+
+  _init_tvariant_bool(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_NCHAR), 0);
+  EXPECT_STREQ(t.wpz, L"FALSE");
+  taosVariantDestroy(&t);
+
+  // 2. tinyint to other data types
+  _init_tvariant_tinyint(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_BOOL), 0);
+  EXPECT_EQ(t.i64, 1);
+
+  _init_tvariant_tinyint(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_TINYINT), 0);
+  EXPECT_EQ(t.i64, -27);
+
+  _init_tvariant_tinyint(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_SMALLINT), 0);
+  EXPECT_EQ(t.i64, -27);
+
+  _init_tvariant_tinyint(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_INT), 0);
+  EXPECT_EQ(t.i64, -27);
+
+  _init_tvariant_tinyint(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_BIGINT), 0);
+  EXPECT_EQ(t.i64, -27);
+
+  _init_tvariant_tinyint(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_FLOAT), 0);
+  EXPECT_EQ(t.d, -27);
+
+  _init_tvariant_tinyint(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_DOUBLE), 0);
+  EXPECT_EQ(t.d, -27);
+
+  _init_tvariant_tinyint(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_BINARY), 0);
+  EXPECT_STREQ(t.pz, "-27");
+  taosVariantDestroy(&t);
+
+  _init_tvariant_tinyint(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_NCHAR), 0);
+  EXPECT_STREQ(t.wpz, L"-27");
+  taosVariantDestroy(&t);
+
+  // 3. int to other data
+  // types//////////////////////////////////////////////////////////////////
+  _init_tvariant_int(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_BOOL), 0);
+  EXPECT_EQ(t.i64, 1);
+
+  _init_tvariant_int(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_TINYINT), 0);
+
+  _init_tvariant_int(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_SMALLINT), 0);
+
+  _init_tvariant_int(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_INT), 0);
+  EXPECT_EQ(t.i64, -23997659);
+
+  _init_tvariant_int(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_BIGINT), 0);
+  EXPECT_EQ(t.i64, -23997659);
+
+  _init_tvariant_int(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_FLOAT), 0);
+  EXPECT_EQ(t.d, -23997659);
+
+  _init_tvariant_int(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_DOUBLE), 0);
+  EXPECT_EQ(t.d, -23997659);
+
+  _init_tvariant_int(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_BINARY), 0);
+  EXPECT_STREQ(t.pz, "-23997659");
+  taosVariantDestroy(&t);
+
+  _init_tvariant_int(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_NCHAR), 0);
+  EXPECT_STREQ(t.wpz, L"-23997659");
+  taosVariantDestroy(&t);
+
+  // 4. bigint to other data
+  // type//////////////////////////////////////////////////////////////////////////////
+  _init_tvariant_bigint(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_BOOL), 0);
+  EXPECT_EQ(t.i64, 1);
+
+  _init_tvariant_bigint(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_TINYINT), 0);
+
+  _init_tvariant_bigint(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_SMALLINT), 0);
+
+  _init_tvariant_bigint(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_INT), 0);
+
+  _init_tvariant_bigint(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_BIGINT), 0);
+  EXPECT_EQ(t.i64, -3333333333333);
+
+  _init_tvariant_bigint(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_FLOAT), 0);
+  EXPECT_EQ(t.d, -3333333333333);
+
+  _init_tvariant_bigint(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_DOUBLE), 0);
+  EXPECT_EQ(t.d, -3333333333333);
+
+  _init_tvariant_bigint(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_BINARY), 0);
+  EXPECT_STREQ(t.pz, "-3333333333333");
+  taosVariantDestroy(&t);
+
+  _init_tvariant_bigint(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_NCHAR), 0);
+  EXPECT_STREQ(t.wpz, L"-3333333333333");
+  taosVariantDestroy(&t);
+
+  // 5. float to other data
+  // types////////////////////////////////////////////////////////////////////////
+  _init_tvariant_float(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_BOOL), 0);
+  EXPECT_EQ(t.i64, 1);
+
+  _init_tvariant_float(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_BIGINT), 0);
+  EXPECT_EQ(t.i64, -8991212199);
+
+  _init_tvariant_float(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_FLOAT), 0);
+  EXPECT_DOUBLE_EQ(t.d, -8991212199.8987885);
+
+  _init_tvariant_float(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_DOUBLE), 0);
+  EXPECT_DOUBLE_EQ(t.d, -8991212199.8987885);
+
+  _init_tvariant_float(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_BINARY), 0);
+  EXPECT_STREQ(t.pz, "-8991212199.898788");
+  taosVariantDestroy(&t);
+
+  _init_tvariant_float(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_NCHAR), 0);
+  EXPECT_STREQ(t.wpz, L"-8991212199.898788");
+  taosVariantDestroy(&t);
+
+  // 6. binary to other data types
+  // //////////////////////////////////////////////////////////////////
+  t.pz = "true";
+  t.nLen = strlen(t.pz);
+  t.nType = TSDB_DATA_TYPE_BINARY;
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_BOOL), 0);
+  EXPECT_EQ(t.i64, 1);
+
+  _init_tvariant_binary(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_BOOL), -1);
+
+  _init_tvariant_binary(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_BIGINT), 0);
+  EXPECT_EQ(t.i64, 200000);
+
+  _init_tvariant_binary(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_FLOAT), 0);
+  EXPECT_DOUBLE_EQ(t.d, 200000);
+
+  _init_tvariant_binary(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_DOUBLE), 0);
+  EXPECT_DOUBLE_EQ(t.d, 200000);
+
+  _init_tvariant_binary(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_BINARY), 0);
+  EXPECT_STREQ(t.pz, "2e5");
+  taosVariantDestroy(&t);
+
+  _init_tvariant_binary(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_NCHAR), 0);
+  EXPECT_STREQ(t.wpz, L"2e5");
+  taosVariantDestroy(&t);
+
+  // 7. nchar to other data types
+  // //////////////////////////////////////////////////////////////////
+  t.wpz = L"FALSE";
+  t.nLen = wcslen(t.wpz);
+  t.nType = TSDB_DATA_TYPE_NCHAR;
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_BOOL), 0);
+  EXPECT_EQ(t.i64, 0);
+
+  _init_tvariant_nchar(&t);
+  EXPECT_LE(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_BOOL), 0);
+
+  _init_tvariant_nchar(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_BIGINT), 0);
+  EXPECT_EQ(t.i64, -2000000);
+
+  _init_tvariant_nchar(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_FLOAT), 0);
+  EXPECT_DOUBLE_EQ(t.d, -2000000.8765);
+
+  _init_tvariant_nchar(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_DOUBLE), 0);
+  EXPECT_DOUBLE_EQ(t.d, -2000000.8765);
+
+  _init_tvariant_nchar(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_BINARY), 0);
+  EXPECT_STREQ(t.pz, "-2000000.8765");
+  taosVariantDestroy(&t);
+
+  _init_tvariant_nchar(&t);
+  EXPECT_EQ(taosVariantTypeSetType(&t, TSDB_DATA_TYPE_NCHAR), 0);
+  EXPECT_STREQ(t.wpz, L"-2000000.8765");
+  taosVariantDestroy(&t);
+}
+#endif
+
+TEST(testCase, tGetToken_Test) {
+  char*    s = ".123 ";
+  uint32_t type = 0;
+
+  int32_t len = tGetToken(s, &type);
+  EXPECT_EQ(type, TK_FLOAT);
+  EXPECT_EQ(len, strlen(s) - 1);
+
+  char s1[] = "1.123e10 ";
+  len = tGetToken(s1, &type);
+  EXPECT_EQ(type, TK_FLOAT);
+  EXPECT_EQ(len, strlen(s1) - 1);
+
+  char s4[] = "0xff ";
+  len = tGetToken(s4, &type);
+  EXPECT_EQ(type, TK_HEX);
+  EXPECT_EQ(len, strlen(s4) - 1);
+
+  // invalid data type
+  char s2[] = "e10 ";
+  len = tGetToken(s2, &type);
+  EXPECT_FALSE(type == TK_FLOAT);
+
+  char s3[] = "1.1.1.1";
+  len = tGetToken(s3, &type);
+  EXPECT_EQ(type, TK_IPTOKEN);
+  EXPECT_EQ(len, strlen(s3));
+
+  char s5[] = "0x ";
+  len = tGetToken(s5, &type);
+  EXPECT_FALSE(type == TK_HEX);
+}
+
+TEST(testCase, isValidNumber_test) {
+  SToken t1 = createToken("123abc");
+
+  EXPECT_EQ(tGetNumericStringType(&t1), TK_ILLEGAL);
+
+  t1 = createToken("0xabc");
+  EXPECT_EQ(tGetNumericStringType(&t1), TK_HEX);
+
+  t1 = createToken("0b11101");
+  EXPECT_EQ(tGetNumericStringType(&t1), TK_BIN);
+
+  t1 = createToken(".134abc");
+  EXPECT_EQ(tGetNumericStringType(&t1), TK_ILLEGAL);
+
+  t1 = createToken("1e1 ");
+  EXPECT_EQ(tGetNumericStringType(&t1), TK_ILLEGAL);
+
+  t1 = createToken("1+2");
+  EXPECT_EQ(tGetNumericStringType(&t1), TK_ILLEGAL);
+
+  t1 = createToken("-0x123");
+  EXPECT_EQ(tGetNumericStringType(&t1), TK_HEX);
+
+  t1 = createToken("-1");
+  EXPECT_EQ(tGetNumericStringType(&t1), TK_INTEGER);
+
+  t1 = createToken("-0b1110");
+  EXPECT_EQ(tGetNumericStringType(&t1), TK_BIN);
+
+  t1 = createToken("-.234");
+  EXPECT_EQ(tGetNumericStringType(&t1), TK_FLOAT);
+}
+
+TEST(testCase, generateAST_test) {
+  SSqlInfo info = doGenerateAST("select * from t1 where ts < now");
+  ASSERT_EQ(info.valid, true);
+}
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