enh(query): add spread function distributed splitting

include/libs/function/functionMgt.h

@@ -125,6 +125,8 @@ typedef enum EFunctionType {
   // distributed splitting functions
   FUNCTION_TYPE_APERCENTILE_PARTIAL,
   FUNCTION_TYPE_APERCENTILE_MERGE,
+  FUNCTION_TYPE_SPREAD_PARTIAL,
+  FUNCTION_TYPE_SPREAD_MERGE,
 
   // user defined funcion
   FUNCTION_TYPE_UDF = 10000

source/libs/function/src/builtins.c

@@ -1279,6 +1279,28 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .processFunc  = spreadFunction,
     .finalizeFunc = spreadFinalize
   },
+  {
+    .name = "_spread_partial",
+    .type = FUNCTION_TYPE_SPREAD_PARTIAL,
+    .classification = FUNC_MGT_AGG_FUNC,
+    .translateFunc = translateSpread,
+    .dataRequiredFunc = statisDataRequired,
+    .getEnvFunc   = getSpreadFuncEnv,
+    .initFunc     = spreadFunctionSetup,
+    .processFunc  = spreadFunction,
+    .finalizeFunc = spreadFinalize
+  },
+  {
+    .name = "_spread_merge",
+    .type = FUNCTION_TYPE_SPREAD_MERGE,
+    .classification = FUNC_MGT_AGG_FUNC,
+    .translateFunc = translateSpread,
+    .dataRequiredFunc = statisDataRequired,
+    .getEnvFunc   = getSpreadFuncEnv,
+    .initFunc     = spreadFunctionSetup,
+    .processFunc  = spreadFunction,
+    .finalizeFunc = spreadFinalize
+  },
   {
     .name = "elapsed",
     .type = FUNCTION_TYPE_ELAPSED,