enh: downgrade value node type

source/libs/scalar/inc/sclInt.h

@@ -31,6 +31,7 @@ typedef struct SOperatorValueType {
 typedef struct SScalarCtx {
   int32_t      code;
   bool         dual;
+  bool         compOp;
   SArray      *pBlockList;  /* element is SSDataBlock* */
   SHashObj    *pRes;  /* element is SScalarParam */
   void        *param;      // additional parameter (meta actually) for acquire value such as tbname/tags values
@@ -45,6 +46,8 @@ typedef struct SScalarCtx {
 #define SCL_IS_CONST_CALC(_ctx) (NULL == (_ctx)->pBlockList)
 //#define SCL_IS_NULL_VALUE_NODE(_node) ((QUERY_NODE_VALUE == nodeType(_node)) && (TSDB_DATA_TYPE_NULL == ((SValueNode *)_node)->node.resType.type) && (((SValueNode *)_node)->placeholderNo <= 0))
 #define SCL_IS_NULL_VALUE_NODE(_node) ((QUERY_NODE_VALUE == nodeType(_node)) && (TSDB_DATA_TYPE_NULL == ((SValueNode *)_node)->node.resType.type))
+#define SCL_IS_COMPARISON_OPERATOR(_opType) ((_opType) >= OP_TYPE_GREATER_THAN && (_opType) < OP_TYPE_IS_NOT_UNKNOWN)
+#define SCL_DOWNGRADE_DATETYPE(_type) ((_type) == TSDB_DATA_TYPE_BIGINT || TSDB_DATA_TYPE_DOUBLE == (_type) || (_type) == TSDB_DATA_TYPE_UBIGINT)
 
 #define sclFatal(...)  qFatal(__VA_ARGS__)
 #define sclError(...)  qError(__VA_ARGS__)

source/libs/scalar/src/scalar.c

@@ -219,6 +219,18 @@ void sclFreeParamList(SScalarParam *param, int32_t paramNum) {
   taosMemoryFree(param);
 }
 
+void sclDowngradeValueType(SValueNode *valueNode) {
+  switch (valueNode->node.resType.type) {
+    case TSDB_DATA_TYPE_BIGINT: {
+    
+    }
+    case TSDB_DATA_TYPE_UBIGINT:
+    case TSDB_DATA_TYPE_DOUBLE:
+    default:
+      break;
+  }
+}
+
 int32_t sclInitParam(SNode* node, SScalarParam *param, SScalarCtx *ctx, int32_t *rowNum) {
   switch (nodeType(node)) {
     case QUERY_NODE_LEFT_VALUE: {
@@ -231,6 +243,10 @@ int32_t sclInitParam(SNode* node, SScalarParam *param, SScalarCtx *ctx, int32_t
 
       ASSERT(param->columnData == NULL);
       param->numOfRows = 1;
+      if (ctx->compOp && SCL_DOWNGRADE_DATETYPE(valueNode->node.resType.type)) {
+        sclDowngradeValueType(valueNode);
+      }
+      
       /*int32_t code = */sclCreateColumnInfoData(&valueNode->node.resType, 1, param);
       if (TSDB_DATA_TYPE_NULL == valueNode->node.resType.type || valueNode->isNull) {
         colDataAppendNULL(param->columnData, 0);
@@ -437,6 +453,7 @@ int32_t sclInitOperatorParams(SScalarParam **pParams, SOperatorNode *node, SScal
   }
 
   sclSetOperatorValueType(node, ctx);
+  ctx->compOp = SCL_IS_COMPARISON_OPERATOR(node->opType);
 
   SCL_ERR_JRET(sclInitParam(node->pLeft, &paramList[0], ctx, rowNum));
   if (paramNum > 1) {