81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "taosudf.h"
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DLL_EXPORT int32_t udf2_init() { return 0; }
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DLL_EXPORT int32_t udf2_destroy() { return 0; }
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DLL_EXPORT int32_t udf2_start(SUdfInterBuf* buf) {
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if(buf->buf == NULL || buf->bufLen < (sizeof(int64_t))) return TSDB_CODE_UDF_INVALID_BUFSIZE;
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*(int64_t*)(buf->buf) = 0;
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buf->bufLen = sizeof(double);
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buf->numOfResult = 1;
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return 0;
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}
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DLL_EXPORT int32_t udf2(SUdfDataBlock* block, SUdfInterBuf* interBuf, SUdfInterBuf* newInterBuf) {
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if(newInterBuf->buf == NULL || newInterBuf->bufLen < (sizeof(double))) return TSDB_CODE_UDF_INVALID_BUFSIZE;
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double sumSquares = 0;
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if (interBuf->numOfResult == 1) {
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sumSquares = *(double*)interBuf->buf;
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}
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int8_t numNotNull = 0;
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for (int32_t i = 0; i < block->numOfCols; ++i) {
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SUdfColumn* col = block->udfCols[i];
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if (!(col->colMeta.type == TSDB_DATA_TYPE_INT || col->colMeta.type == TSDB_DATA_TYPE_DOUBLE)) {
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return TSDB_CODE_UDF_INVALID_INPUT;
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}
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}
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for (int32_t i = 0; i < block->numOfCols; ++i) {
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for (int32_t j = 0; j < block->numOfRows; ++j) {
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SUdfColumn* col = block->udfCols[i];
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if (udfColDataIsNull(col, j)) {
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continue;
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}
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switch (col->colMeta.type) {
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case TSDB_DATA_TYPE_INT: {
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char* cell = udfColDataGetData(col, j);
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int32_t num = *(int32_t*)cell;
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sumSquares += (double)num * num;
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break;
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}
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case TSDB_DATA_TYPE_DOUBLE: {
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char* cell = udfColDataGetData(col, j);
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double num = *(double*)cell;
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sumSquares += num * num;
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break;
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}
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default:
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break;
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}
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++numNotNull;
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}
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}
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*(double*)(newInterBuf->buf) = sumSquares;
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newInterBuf->bufLen = sizeof(double);
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if (interBuf->numOfResult == 0 && numNotNull == 0) {
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newInterBuf->numOfResult = 0;
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} else {
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newInterBuf->numOfResult = 1;
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}
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return 0;
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}
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DLL_EXPORT int32_t udf2_finish(SUdfInterBuf* buf, SUdfInterBuf* resultData) {
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if (buf->numOfResult == 0) {
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resultData->numOfResult = 0;
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return 0;
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}
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double sumSquares = *(double*)(buf->buf);
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*(double*)(resultData->buf) = sqrt(sumSquares);
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resultData->bufLen = sizeof(double);
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resultData->numOfResult = 1;
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return 0;
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}
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