enh(query): add histogram function distributed splitting

TD-16321

include/libs/function/functionMgt.h

@@ -127,6 +127,8 @@ typedef enum EFunctionType {
   FUNCTION_TYPE_APERCENTILE_MERGE,
   FUNCTION_TYPE_SPREAD_PARTIAL,
   FUNCTION_TYPE_SPREAD_MERGE,
+  FUNCTION_TYPE_HISTOGRAM_PARTIAL,
+  FUNCTION_TYPE_HISTOGRAM_MERGE,
 
   // user defined funcion
   FUNCTION_TYPE_UDF = 10000

source/libs/function/src/builtins.c

@@ -1393,6 +1393,26 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .processFunc  = histogramFunction,
     .finalizeFunc = histogramFinalize
   },
+  {
+    .name = "_histogram_partial",
+    .type = FUNCTION_TYPE_HISTOGRAM_PARTIAL,
+    .classification = FUNC_MGT_AGG_FUNC,
+    .translateFunc = translateHistogram,
+    .getEnvFunc   = getHistogramFuncEnv,
+    .initFunc     = histogramFunctionSetup,
+    .processFunc  = histogramFunction,
+    .finalizeFunc = histogramFinalize
+  },
+  {
+    .name = "_histogram_merge",
+    .type = FUNCTION_TYPE_HISTOGRAM_MERGE,
+    .classification = FUNC_MGT_AGG_FUNC,
+    .translateFunc = translateHistogram,
+    .getEnvFunc   = getHistogramFuncEnv,
+    .initFunc     = histogramFunctionSetup,
+    .processFunc  = histogramFunction,
+    .finalizeFunc = histogramFinalize
+  },
   {
     .name = "hyperloglog",
     .type = FUNCTION_TYPE_HYPERLOGLOG,