fix user-specified constant value selection with join query

src/client/src/tscSQLParser.c

@@ -1881,7 +1881,7 @@ static void addProjectQueryCol(SQueryInfo* pQueryInfo, int32_t startPos, SColumn
   ids.num = 1;
   ids.ids[0] = *pIndex;
 
-  if (pIndex->columnIndex == TSDB_TBNAME_COLUMN_INDEX || pIndex->columnIndex == TSDB_UD_COLUMN_INDEX ||
+  if (pIndex->columnIndex == TSDB_TBNAME_COLUMN_INDEX || pIndex->columnIndex <= TSDB_UD_COLUMN_INDEX ||
       pIndex->columnIndex >= tscGetNumOfColumns(pTableMeta)) {
     ids.num = 0;
   }

src/query/src/qExecutor.c

@@ -8150,8 +8150,8 @@ int32_t createQueryFunc(SQueriedTableInfo* pTableInfo, int32_t numOfOutput, SExp
       // it is a user-defined constant value column
       assert(pExprs[i].base.functionId == TSDB_FUNC_PRJ);
 
-      type = pExprs[i].base.param[1].nType;
-      bytes = pExprs[i].base.param[1].nLen;
+      type = pExprs[i].base.param[0].nType;
+      bytes = pExprs[i].base.param[0].nLen;
       if (type == TSDB_DATA_TYPE_BINARY || type == TSDB_DATA_TYPE_NCHAR) {
         bytes += VARSTR_HEADER_SIZE;
       }