[TD-288]support alias name in from clause

src/client/src/sql.c

@@ -2404,19 +2404,41 @@ static void yy_reduce(
 {yymsp[-1].minor.yy30 = yymsp[0].minor.yy30;}
         break;
       case 137: /* tablelist ::= ids cpxName */
-{ toTSDBType(yymsp[-1].minor.yy0.type); yymsp[-1].minor.yy0.n += yymsp[0].minor.yy0.n; yylhsminor.yy30 = tVariantListAppendToken(NULL, &yymsp[-1].minor.yy0, -1); yylhsminor.yy30 = tVariantListAppendToken(yylhsminor.yy30, &yymsp[-1].minor.yy0, -1);}
+{
+   toTSDBType(yymsp[-1].minor.yy0.type);
+   yymsp[-1].minor.yy0.n += yymsp[0].minor.yy0.n;
+   yylhsminor.yy30 = tVariantListAppendToken(NULL, &yymsp[-1].minor.yy0, -1);
+   yylhsminor.yy30 = tVariantListAppendToken(yylhsminor.yy30, &yymsp[-1].minor.yy0, -1);
+}
   yymsp[-1].minor.yy30 = yylhsminor.yy30;
         break;
       case 138: /* tablelist ::= ids cpxName ids */
-{ toTSDBType(yymsp[-2].minor.yy0.type); yymsp[-2].minor.yy0.n += yymsp[-1].minor.yy0.n; yylhsminor.yy30 = tVariantListAppendToken(NULL, &yymsp[-2].minor.yy0, -1); yylhsminor.yy30 = tVariantListAppendToken(yylhsminor.yy30, &yymsp[0].minor.yy0, -1);}
+{
+   toTSDBType(yymsp[-2].minor.yy0.type);
+   toTSDBType(yymsp[0].minor.yy0.type);
+   yymsp[-2].minor.yy0.n += yymsp[-1].minor.yy0.n;
+   yylhsminor.yy30 = tVariantListAppendToken(NULL, &yymsp[-2].minor.yy0, -1);
+   yylhsminor.yy30 = tVariantListAppendToken(yylhsminor.yy30, &yymsp[0].minor.yy0, -1);
+}
   yymsp[-2].minor.yy30 = yylhsminor.yy30;
         break;
       case 139: /* tablelist ::= tablelist COMMA ids cpxName */
-{ toTSDBType(yymsp[-1].minor.yy0.type); yymsp[-1].minor.yy0.n += yymsp[0].minor.yy0.n; yylhsminor.yy30 = tVariantListAppendToken(yymsp[-3].minor.yy30, &yymsp[-1].minor.yy0, -1);  yylhsminor.yy30 = tVariantListAppendToken(yylhsminor.yy30, &yymsp[-1].minor.yy0, -1); }
+{
+   toTSDBType(yymsp[-1].minor.yy0.type);
+   yymsp[-1].minor.yy0.n += yymsp[0].minor.yy0.n;
+   yylhsminor.yy30 = tVariantListAppendToken(yymsp[-3].minor.yy30, &yymsp[-1].minor.yy0, -1);
+   yylhsminor.yy30 = tVariantListAppendToken(yylhsminor.yy30, &yymsp[-1].minor.yy0, -1);
+}
   yymsp[-3].minor.yy30 = yylhsminor.yy30;
         break;
       case 140: /* tablelist ::= tablelist COMMA ids cpxName ids */
-{ toTSDBType(yymsp[-2].minor.yy0.type); yymsp[-2].minor.yy0.n += yymsp[-1].minor.yy0.n; yylhsminor.yy30 = tVariantListAppendToken(yymsp[-4].minor.yy30, &yymsp[-2].minor.yy0, -1); yylhsminor.yy30 = tVariantListAppendToken(yylhsminor.yy30, &yymsp[0].minor.yy0, -1);  }
+{
+   toTSDBType(yymsp[-2].minor.yy0.type);
+   toTSDBType(yymsp[0].minor.yy0.type);
+   yymsp[-2].minor.yy0.n += yymsp[-1].minor.yy0.n;
+   yylhsminor.yy30 = tVariantListAppendToken(yymsp[-4].minor.yy30, &yymsp[-2].minor.yy0, -1);
+   yylhsminor.yy30 = tVariantListAppendToken(yylhsminor.yy30, &yymsp[0].minor.yy0, -1);
+}
   yymsp[-4].minor.yy30 = yylhsminor.yy30;
         break;
       case 141: /* tmvar ::= VARIABLE */

src/client/src/tscSQLParser.c

@@ -2011,9 +2011,8 @@ int32_t getMeterIndex(SSQLToken* pTableToken, SQueryInfo* pQueryInfo, SColumnInd
 
   for (int32_t i = 0; i < pQueryInfo->numOfTables; ++i) {
     SMeterMetaInfo* pMeterMetaInfo = tscGetMeterMetaInfoFromQueryInfo(pQueryInfo, i);
-    extractTableName(pMeterMetaInfo->name, tableName);
-
-    if (strncasecmp(tableName, pTableToken->z, pTableToken->n) == 0 && strlen(tableName) == pTableToken->n) {
+    if (strncasecmp(pMeterMetaInfo->aliasName, pTableToken->z, pTableToken->n) == 0 &&
+        strlen(pMeterMetaInfo->aliasName) == pTableToken->n) {
       pIndex->tableIndex = i;
       break;
     }
@@ -5603,7 +5602,8 @@ int32_t doCheckForQuery(SSqlObj* pSql, SQuerySQL* pQuerySql, int32_t index) {
   const char* msg7 = "illegal number of tables in from clause";
   const char* msg8 = "too many columns in selection clause";
   const char* msg9 = "TWA query requires both the start and end time";
-
+  const char* msg10 = "alias name too long";
+  
   int32_t code = TSDB_CODE_SUCCESS;
 
   SSqlCmd* pCmd = &pSql->cmd;
@@ -5632,8 +5632,8 @@ int32_t doCheckForQuery(SSqlObj* pSql, SQuerySQL* pQuerySql, int32_t index) {
     return doLocalQueryProcess(pQueryInfo, pQuerySql);
   }
   
-  if (pQuerySql->from->nExpr > 1) {
-    if (pQuerySql->from->nExpr > 2) {   // not support more than 2 tables join query
+  if (pQuerySql->from->nExpr > 2) {
+    if (pQuerySql->from->nExpr > 4) {   // not support more than 2 tables join query
       return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg7);
     }
     
@@ -5644,7 +5644,7 @@ int32_t doCheckForQuery(SSqlObj* pSql, SQuerySQL* pQuerySql, int32_t index) {
   pQueryInfo->command = TSDB_SQL_SELECT;
 
   // set all query tables, which are maybe more than one.
-  for (int32_t i = 0; i < pQuerySql->from->nExpr; ++i) {
+  for (int32_t i = 0; i < pQuerySql->from->nExpr; i += 2) {
     tVariant* pTableItem = &pQuerySql->from->a[i].pVar;
 
     if (pTableItem->nType != TSDB_DATA_TYPE_BINARY) {
@@ -5673,9 +5673,17 @@ int32_t doCheckForQuery(SSqlObj* pSql, SQuerySQL* pQuerySql, int32_t index) {
     if (code != TSDB_CODE_SUCCESS) {
       return code;
     }
+    
+    //set the alias name
+    tVariant* aliasName = &pQuerySql->from->a[i + 1].pVar;
+    if (aliasName->nLen > TSDB_METER_NAME_LEN) {
+      return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg10);
+    }
+    
+    tVariantDump(aliasName, pMeterInfo1->aliasName, TSDB_DATA_TYPE_BINARY);
   }
 
-  assert(pQueryInfo->numOfTables == pQuerySql->from->nExpr);
+  assert(pQueryInfo->numOfTables == pQuerySql->from->nExpr / 2);
 
   // parse the group by clause in the first place
   if (parseGroupbyClause(pQueryInfo, pQuerySql->pGroupby, pCmd) != TSDB_CODE_SUCCESS) {

src/inc/sql.y

@@ -406,10 +406,35 @@ as(X) ::= .             { X.n = 0;  }
 from(A) ::= FROM tablelist(X).                 {A = X;}
 
 %type tablelist {tVariantList*}
-tablelist(A) ::= ids(X) cpxName(Y).                    { toTSDBType(X.type); X.n += Y.n; A = tVariantListAppendToken(NULL, &X, -1); A = tVariantListAppendToken(A, &X, -1);}
-tablelist(A) ::= ids(X) cpxName(Y) ids(Z).             { toTSDBType(X.type); X.n += Y.n; A = tVariantListAppendToken(NULL, &X, -1); A = tVariantListAppendToken(A, &Z, -1);}
-tablelist(A) ::= tablelist(Y) COMMA ids(X) cpxName(Z). { toTSDBType(X.type); X.n += Z.n; A = tVariantListAppendToken(Y, &X, -1);  A = tVariantListAppendToken(A, &X, -1); }
-tablelist(A) ::= tablelist(Y) COMMA ids(X) cpxName(Z) ids(F). { toTSDBType(X.type); X.n += Z.n; A = tVariantListAppendToken(Y, &X, -1); A = tVariantListAppendToken(A, &F, -1);  }
+tablelist(A) ::= ids(X) cpxName(Y).                    {
+   toTSDBType(X.type);
+   X.n += Y.n;
+   A = tVariantListAppendToken(NULL, &X, -1);
+   A = tVariantListAppendToken(A, &X, -1);
+}
+
+tablelist(A) ::= ids(X) cpxName(Y) ids(Z).             {
+   toTSDBType(X.type);
+   toTSDBType(Z.type);
+   X.n += Y.n;
+   A = tVariantListAppendToken(NULL, &X, -1);
+   A = tVariantListAppendToken(A, &Z, -1);
+}
+
+tablelist(A) ::= tablelist(Y) COMMA ids(X) cpxName(Z). {
+   toTSDBType(X.type);
+   X.n += Z.n;
+   A = tVariantListAppendToken(Y, &X, -1);
+   A = tVariantListAppendToken(A, &X, -1);
+}
+
+tablelist(A) ::= tablelist(Y) COMMA ids(X) cpxName(Z) ids(F). {
+   toTSDBType(X.type);
+   toTSDBType(F.type);
+   X.n += Z.n;
+   A = tVariantListAppendToken(Y, &X, -1);
+   A = tVariantListAppendToken(A, &F, -1);
+}
 
 // The value of interval should be the form of "number+[a,s,m,h,d,n,y]" or "now"
 %type tmvar {SSQLToken}