fix: support writing streams to existing tables

source/libs/parser/src/parTranslater.c

@@ -5662,6 +5662,30 @@ static int32_t addTagsToCreateStreamQuery(STranslateContext* pCxt, SCreateStream
   return TSDB_CODE_SUCCESS;
 }
 
+static SNode* createNullValue() {
+  SValueNode* pValue = (SValueNode*)nodesMakeNode(QUERY_NODE_VALUE);
+  if (NULL == pValue) {
+    return NULL;
+  }
+  pValue->isNull = true;
+  pValue->node.resType.type = TSDB_DATA_TYPE_NULL;
+  pValue->node.resType.bytes = tDataTypes[TSDB_DATA_TYPE_NULL].bytes;
+  return (SNode*)pValue;
+}
+
+static int32_t addNullTagsForExistTable(STranslateContext* pCxt, STableMeta* pMeta, SSelectStmt* pSelect) {
+  if (NULL == pMeta) {
+    return TSDB_CODE_SUCCESS;
+  }
+
+  int32_t numOfTags = getNumOfTags(pMeta);
+  int32_t code = TSDB_CODE_SUCCESS;
+  for (int32_t i = 0; TSDB_CODE_SUCCESS == code && i < numOfTags; ++i) {
+    code = nodesListMakeStrictAppend(&pSelect->pTags, createNullValue());
+  }
+  return code;
+}
+
 typedef struct SRewriteSubtableCxt {
   STranslateContext* pCxt;
   SNodeList*         pPartitionList;
@@ -5707,13 +5731,11 @@ static int32_t addSubtableNameToCreateStreamQuery(STranslateContext* pCxt, SCrea
   return pCxt->errCode;
 }
 
-static int32_t addSubtableInfoToCreateStreamQuery(STranslateContext* pCxt, SCreateStreamStmt* pStmt) {
+static int32_t addSubtableInfoToCreateStreamQuery(STranslateContext* pCxt, STableMeta* pMeta,
+                                                  SCreateStreamStmt* pStmt) {
   SSelectStmt* pSelect = (SSelectStmt*)pStmt->pQuery;
   if (NULL == pSelect->pPartitionByList) {
-    if (NULL != pStmt->pTags || NULL != pStmt->pSubtable) {
-      return generateSyntaxErrMsgExt(&pCxt->msgBuf, TSDB_CODE_PAR_INVALID_STREAM_QUERY, "Unsupported stream query");
-    }
-    return TSDB_CODE_SUCCESS;
+    return addNullTagsForExistTable(pCxt, pMeta, pSelect);
   }
 
   int32_t code = addTagsToCreateStreamQuery(pCxt, pStmt, pSelect);
@@ -5914,17 +5936,6 @@ static int32_t adjustDataTypeOfTags(STranslateContext* pCxt, const STableMeta* p
   return TSDB_CODE_SUCCESS;
 }
 
-static SNode* createNullValue() {
-  SValueNode* pValue = (SValueNode*)nodesMakeNode(QUERY_NODE_VALUE);
-  if (NULL == pValue) {
-    return NULL;
-  }
-  pValue->isNull = true;
-  pValue->node.resType.type = TSDB_DATA_TYPE_NULL;
-  pValue->node.resType.bytes = tDataTypes[TSDB_DATA_TYPE_NULL].bytes;
-  return (SNode*)pValue;
-}
-
 static int32_t adjustOrderOfTags(STranslateContext* pCxt, SNodeList* pTags, const STableMeta* pMeta,
                                  SNodeList** pTagExprs, SCMCreateStreamReq* pReq) {
   if (LIST_LENGTH(pTags) != LIST_LENGTH(*pTagExprs)) {
@@ -5993,6 +6004,9 @@ static int32_t adjustOrderOfTags(STranslateContext* pCxt, SNodeList* pTags, cons
 static int32_t adjustTagsForExistTable(STranslateContext* pCxt, SCreateStreamStmt* pStmt, const STableMeta* pMeta,
                                        SCMCreateStreamReq* pReq) {
   SSelectStmt* pSelect = (SSelectStmt*)pStmt->pQuery;
+  if (NULL == pSelect->pPartitionByList) {
+    return TSDB_CODE_SUCCESS;
+  }
   if (NULL == pStmt->pTags) {
     return adjustDataTypeOfTags(pCxt, pMeta, pSelect->pTags);
   }
@@ -6021,7 +6035,7 @@ static int32_t buildCreateStreamQuery(STranslateContext* pCxt, SCreateStreamStmt
   STableMeta* pMeta = NULL;
   int32_t     code = translateStreamTargetTable(pCxt, pStmt, pReq, &pMeta);
   if (TSDB_CODE_SUCCESS == code) {
-    code = addSubtableInfoToCreateStreamQuery(pCxt, pStmt);
+    code = addSubtableInfoToCreateStreamQuery(pCxt, pMeta, pStmt);
   }
   if (TSDB_CODE_SUCCESS == code) {
     code = translateQuery(pCxt, pStmt->pQuery);