feature: udf dispatch first by script type then by udf name

include/libs/function/taosudf.h

@@ -259,6 +259,39 @@ typedef int32_t (*TUdfAggProcessFunc)(SUdfDataBlock *block, SUdfInterBuf *interB
 typedef int32_t (*TUdfAggMergeFunc)(SUdfInterBuf *inputBuf1, SUdfInterBuf *inputBuf2, SUdfInterBuf *outputBuf);
 typedef int32_t (*TUdfAggFinishFunc)(SUdfInterBuf *buf, SUdfInterBuf *resultData);
 
+//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// TODO: capacity for path and 
+// define macro for name and path len or use dynamic allocation/shared with SUdf.
+
+typedef struct SUdfInfo {
+  char name[65];
+
+  int8_t  funcType;
+  int8_t  scriptType;
+  int8_t  outputType;
+  int32_t outputLen;
+  int32_t bufSize;
+
+  char path[512];
+} SUdfInfo;
+
+// TODO: deprecate SUdfInterBuf.numOfResult or add isInitial to SUdfInterBuf
+
+typedef int32_t (*TScriptUdfScalarProcFunc)(SUdfDataBlock *block, SUdfColumn *resultCol, void *udfCtx);
+
+typedef int32_t (*TScriptUdfAggStartFunc)(SUdfInterBuf *buf, void *udfCtx);
+typedef int32_t (*TScriptUdfAggProcessFunc)(SUdfDataBlock *block, SUdfInterBuf *interBuf, SUdfInterBuf *newInterBuf,
+                                            void *udfCtx);
+typedef int32_t (*TScriptUdfAggMergeFunc)(SUdfInterBuf *inputBuf1, SUdfInterBuf *inputBuf2, SUdfInterBuf *outputBuf,
+                                          void *udfCtx);
+typedef int32_t (*TScriptUdfAggFinishFunc)(SUdfInterBuf *buf, SUdfInterBuf *resultData, void *udfCtx);
+typedef int32_t (*TScriptUdfInitFunc)(SUdfInfo *info, void **pUdfCtx);
+typedef int32_t (*TScriptUdfDestoryFunc)(void *udfCtx);
+
+// the following function is for open/close script plugin.
+typedef int32_t (*TScriptOpenFunc)(void *scriptCtx);
+typedef int32_t (*TScriptCloseFunc)(void *scriptCtx);
+
 #ifdef __cplusplus
 }
 #endif

include/util/taoserror.h

@@ -695,6 +695,7 @@ int32_t* taosGetErrno();
 #define TSDB_CODE_UDF_NO_FUNC_HANDLE            TAOS_DEF_ERROR_CODE(0, 0x2908)
 #define TSDB_CODE_UDF_INVALID_BUFSIZE           TAOS_DEF_ERROR_CODE(0, 0x2909)
 #define TSDB_CODE_UDF_INVALID_OUTPUT_TYPE       TAOS_DEF_ERROR_CODE(0, 0x290A)
+#define TSDB_CODE_UDF_SCRIPT_NOT_SUPPORTED      TAOS_DEF_ERROR_CODE(0, 0x290B)       
 
 // sml
 #define TSDB_CODE_SML_INVALID_PROTOCOL_TYPE     TAOS_DEF_ERROR_CODE(0, 0x3000)

include/util/tdef.h

@@ -205,7 +205,7 @@ typedef enum ELogicConditionType {
 #define TSDB_FUNC_TYPE_SCALAR    1
 #define TSDB_FUNC_TYPE_AGGREGATE 2
 #define TSDB_FUNC_SCRIPT_BIN_LIB 0
-#define TSDB_FUNC_SCRIPT_LUA     1
+#define TSDB_FUNC_SCRIPT_PYTHON     1
 #define TSDB_FUNC_MAX_RETRIEVE   1024
 
 #define TSDB_INDEX_NAME_LEN      65  // 64 + 1 '\0'

source/util/src/terror.c

@@ -573,6 +573,7 @@ TAOS_DEFINE_ERROR(TSDB_CODE_UDF_INVALID_INPUT,              "udf invalid functio
 TAOS_DEFINE_ERROR(TSDB_CODE_UDF_NO_FUNC_HANDLE,             "udf no function handle")
 TAOS_DEFINE_ERROR(TSDB_CODE_UDF_INVALID_BUFSIZE,            "udf invalid bufsize")
 TAOS_DEFINE_ERROR(TSDB_CODE_UDF_INVALID_OUTPUT_TYPE,        "udf invalid output type")
+TAOS_DEFINE_ERROR(TSDB_CODE_UDF_SCRIPT_NOT_SUPPORTED,       "udf program language not supported")
 
 //schemaless
 TAOS_DEFINE_ERROR(TSDB_CODE_SML_INVALID_PROTOCOL_TYPE,      "Invalid line protocol type")