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Merge pull request #20815 from taosdata/test/TD-AUTOGETN-3.0
test: add udf function return with varchar demo
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Original file line number | Diff line number | Diff line change |
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#include <string.h> | ||
#include <stdlib.h> | ||
#include <stdio.h> | ||
#include <math.h> | ||
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#include "taosudf.h" | ||
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#define STR_MAX_LEN 256 // inter buffer length | ||
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// init | ||
DLL_EXPORT int32_t max_vol_init() | ||
{ | ||
return 0; | ||
} | ||
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// destory | ||
DLL_EXPORT int32_t max_vol_destroy() | ||
{ | ||
return 0; | ||
} | ||
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// start | ||
DLL_EXPORT int32_t max_vol_start(SUdfInterBuf *buf) | ||
{ | ||
memset(buf->buf, 0, sizeof(float) + STR_MAX_LEN); | ||
// set init value | ||
*((float*)buf->buf) = -10000000; | ||
buf->bufLen = sizeof(float) + STR_MAX_LEN; | ||
buf->numOfResult = 0; | ||
return 0; | ||
} | ||
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DLL_EXPORT int32_t max_vol(SUdfDataBlock *block, SUdfInterBuf *interBuf, SUdfInterBuf *newInterBuf) { | ||
float maxValue = *(float *)interBuf->buf; | ||
char strBuff[STR_MAX_LEN] = "inter1buf"; | ||
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if (block->numOfCols < 2) | ||
{ | ||
return TSDB_CODE_UDF_INVALID_INPUT; | ||
} | ||
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// check data type | ||
for (int32_t i = 0; i < block->numOfCols; ++i) | ||
{ | ||
SUdfColumn *col = block->udfCols[i]; | ||
if( i == block->numOfCols - 1) { | ||
// last column is device id , must varchar | ||
if (col->colMeta.type != TSDB_DATA_TYPE_VARCHAR ) { | ||
return TSDB_CODE_UDF_INVALID_INPUT; | ||
} | ||
} else { | ||
if (col->colMeta.type != TSDB_DATA_TYPE_FLOAT) { | ||
return TSDB_CODE_UDF_INVALID_INPUT; | ||
} | ||
} | ||
} | ||
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// calc max voltage | ||
SUdfColumn *lastCol = block->udfCols[block->numOfCols - 1]; | ||
for (int32_t i = 0; i < (block->numOfCols - 1); ++i) { | ||
for (int32_t j = 0; j < block->numOfRows; ++j) { | ||
SUdfColumn *col = block->udfCols[i]; | ||
if (udfColDataIsNull(col, j)) { | ||
continue; | ||
} | ||
char *data = udfColDataGetData(col, j); | ||
float voltage = *(float *)data; | ||
if (voltage > maxValue) { | ||
maxValue = voltage; | ||
char *valData = udfColDataGetData(lastCol, j); | ||
// get device id | ||
char *deviceId = valData + sizeof(uint16_t); | ||
sprintf(strBuff, "%s_(%d,%d)_%f", deviceId, j, i, maxValue); | ||
} | ||
} | ||
} | ||
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*(float*)newInterBuf->buf = maxValue; | ||
strcpy(newInterBuf->buf + sizeof(float), strBuff); | ||
newInterBuf->bufLen = sizeof(float) + strlen(strBuff)+1; | ||
newInterBuf->numOfResult = 1; | ||
return 0; | ||
} | ||
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DLL_EXPORT int32_t max_vol_finish(SUdfInterBuf *buf, SUdfInterBuf *resultData) | ||
{ | ||
char * str = buf->buf + sizeof(float); | ||
// copy to des | ||
char * des = resultData->buf + sizeof(uint16_t); | ||
strcpy(des, str); | ||
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// set binary type len | ||
uint16_t len = strlen(str); | ||
*((uint16_t*)resultData->buf) = len; | ||
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// set buf len | ||
resultData->bufLen = len + sizeof(uint16_t); | ||
// set row count | ||
resultData->numOfResult = 1; | ||
return 0; | ||
} |