feat(query): add cast function

TD-14242

include/common/ttypes.h

@@ -141,6 +141,43 @@ typedef struct {
     }                                          \
   } while (0)
 
+#define NUM_TO_STRING(_inputType, _input, _outputBytes, _output)     \
+  do {                                         \
+    switch (_inputType) {                      \
+      case TSDB_DATA_TYPE_TINYINT:             \
+        snprintf(_output, (int32_t)(_outputBytes), "%d", *(int8_t *)(_input));     \
+        break;                                 \
+      case TSDB_DATA_TYPE_UTINYINT:            \
+        snprintf(_output, (int32_t)(_outputBytes), "%d", *(uint8_t *)(_input));     \
+        break;                                 \
+      case TSDB_DATA_TYPE_SMALLINT:            \
+        snprintf(_output, (int32_t)(_outputBytes), "%d", *(int16_t *)(_input));     \
+        break;                                 \
+      case TSDB_DATA_TYPE_USMALLINT:           \
+        snprintf(_output, (int32_t)(_outputBytes), "%d", *(uint16_t *)(_input));     \
+        break;                                 \
+      case TSDB_DATA_TYPE_TIMESTAMP:           \
+      case TSDB_DATA_TYPE_BIGINT:              \
+        snprintf(_output, (int32_t)(_outputBytes), "%" PRId64, *(int64_t *)(_input));     \
+        break;                                 \
+      case TSDB_DATA_TYPE_UBIGINT:             \
+        snprintf(_output, (int32_t)(_outputBytes), "%" PRIu64, *(uint64_t *)(_input));     \
+        break;                                 \
+      case TSDB_DATA_TYPE_FLOAT:               \
+        snprintf(_output, (int32_t)(_outputBytes), "%f", *(float *)(_input));     \
+        break;                                 \
+      case TSDB_DATA_TYPE_DOUBLE:              \
+        snprintf(_output, (int32_t)(_outputBytes), "%f", *(double *)(_input));     \
+        break;                                 \
+      case TSDB_DATA_TYPE_UINT:                \
+        snprintf(_output, (int32_t)(_outputBytes), "%u", *(uint32_t *)(_input));     \
+        break;                                 \
+      default:                                 \
+        snprintf(_output, (int32_t)(_outputBytes), "%d", *(int32_t *)(_input));     \
+        break;                                 \
+    }                                          \
+  } while (0)
+
 #define IS_SIGNED_NUMERIC_TYPE(_t)   ((_t) >= TSDB_DATA_TYPE_TINYINT && (_t) <= TSDB_DATA_TYPE_BIGINT)
 #define IS_UNSIGNED_NUMERIC_TYPE(_t) ((_t) >= TSDB_DATA_TYPE_UTINYINT && (_t) <= TSDB_DATA_TYPE_UBIGINT)
 #define IS_FLOAT_TYPE(_t)            ((_t) == TSDB_DATA_TYPE_FLOAT || (_t) == TSDB_DATA_TYPE_DOUBLE)

include/libs/scalar/scalar.h

@@ -70,6 +70,9 @@ int32_t ltrimFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOut
 int32_t rtrimFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput);
 int32_t substrFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput);
 
+/* Conversion functions */
+int32_t castFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput);
+
 bool getTimePseudoFuncEnv(struct SFunctionNode* pFunc, SFuncExecEnv* pEnv);
 
 int32_t winStartTsFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput);

source/common/src/tvariant.c

@@ -1028,13 +1028,18 @@ int32_t taosVariantTypeSetType(SVariant *pVariant, char type) {
 
 char * taosVariantGet(SVariant *pVar, int32_t type) {
   switch (type) {
-    case TSDB_DATA_TYPE_BOOL: 
+    case TSDB_DATA_TYPE_BOOL:
     case TSDB_DATA_TYPE_TINYINT:
     case TSDB_DATA_TYPE_SMALLINT:
+    case TSDB_DATA_TYPE_INT:
     case TSDB_DATA_TYPE_BIGINT:
-    case TSDB_DATA_TYPE_INT: 
     case TSDB_DATA_TYPE_TIMESTAMP:
       return (char *)&pVar->i;
+    case TSDB_DATA_TYPE_UTINYINT:
+    case TSDB_DATA_TYPE_USMALLINT:
+    case TSDB_DATA_TYPE_UINT:
+    case TSDB_DATA_TYPE_UBIGINT:
+      return (char *)&pVar->u;
     case TSDB_DATA_TYPE_DOUBLE:
     case TSDB_DATA_TYPE_FLOAT:
       return (char *)&pVar->d;
@@ -1042,7 +1047,7 @@ char * taosVariantGet(SVariant *pVar, int32_t type) {
       return (char *)pVar->pz;
     case TSDB_DATA_TYPE_NCHAR:
       return (char *)pVar->ucs4;
-    default: 
+    default:
       return NULL;
   }
 

source/libs/function/src/builtins.c

@@ -389,7 +389,7 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .checkFunc    = stubCheckAndGetResultType,
     .getEnvFunc   = NULL,
     .initFunc     = NULL,
-    .sprocessFunc = NULL,
+    .sprocessFunc = castFunction,
     .finalizeFunc = NULL
   },
   {
@@ -599,7 +599,13 @@ int32_t stubCheckAndGetResultType(SFunctionNode* pFunc) {
       break;
     }
     case FUNCTION_TYPE_CAST: {
-      pFunc->node.resType = (SDataType) { .bytes = tDataTypes[TSDB_DATA_TYPE_BIGINT].bytes, .type = TSDB_DATA_TYPE_BIGINT };
+      //type
+      SValueNode* pParam = nodesListGetNode(pFunc->pParameterList, 1);
+      int32_t paraType = pParam->datum.i;
+      //bytes
+      pParam = nodesListGetNode(pFunc->pParameterList, 2);
+      int32_t paraBytes = pParam->datum.i;
+      pFunc->node.resType = (SDataType) { .bytes = paraBytes, .type = paraType};
       break;
     }
 

source/libs/parser/src/parAstCreater.c

@@ -255,13 +255,20 @@ SNodeList* addValueNodeFromTypeToList(SAstCreateContext* pCxt, SDataType dataTyp
   char buf[64] = {0};
   //add value node for type
   snprintf(buf, sizeof(buf), "%u", dataType.type);
-  SToken token = {.type = TSDB_DATA_TYPE_TINYINT, .n = strlen(buf), .z = buf};
+  SToken token = {.type = TSDB_DATA_TYPE_SMALLINT, .n = strlen(buf), .z = buf};
   SNode* pNode = createValueNode(pCxt, token.type, &token);
   addNodeToList(pCxt, pList, pNode);
 
   //add value node for bytes
   memset(buf, 0, sizeof(buf));
-  snprintf(buf, sizeof(buf), "%u", dataType.bytes);
+  int32_t bytes;
+  if (IS_VAR_DATA_TYPE(dataType.type)) {
+    bytes = (dataType.type == TSDB_DATA_TYPE_NCHAR) ? dataType.bytes * TSDB_NCHAR_SIZE : dataType.bytes;
+    bytes += VARSTR_HEADER_SIZE;
+  } else {
+    bytes = dataType.bytes;
+  }
+  snprintf(buf, sizeof(buf), "%d", bytes);
   token.type = TSDB_DATA_TYPE_BIGINT;
   token.n = strlen(buf);
   token.z = buf;

source/libs/scalar/src/sclfunc.c

@@ -647,6 +647,159 @@ int32_t substrFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOu
   return TSDB_CODE_SUCCESS;
 }
 
+int32_t castFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput) {
+  if (inputNum!= 3) {
+    return TSDB_CODE_FAILED;
+  }
+
+  int16_t inputType  = pInput[0].columnData->info.type;
+  int16_t outputType = *(int16_t *)pInput[1].columnData->pData;
+  if (outputType != TSDB_DATA_TYPE_BIGINT && outputType != TSDB_DATA_TYPE_UBIGINT &&
+      outputType != TSDB_DATA_TYPE_VARCHAR && outputType != TSDB_DATA_TYPE_NCHAR &&
+      outputType != TSDB_DATA_TYPE_TIMESTAMP) {
+    return TSDB_CODE_FAILED;
+  }
+  int64_t outputLen = *(int64_t *)pInput[2].columnData->pData;
+
+  char *input = NULL;
+  char *outputBuf = taosMemoryCalloc(outputLen * pInput[0].numOfRows, 1);
+  char *output = outputBuf;
+  if (IS_VAR_DATA_TYPE(inputType)) {
+    input = pInput[0].columnData->pData + pInput[0].columnData->varmeta.offset[0];
+  } else {
+    input = pInput[0].columnData->pData;
+  }
+
+  for (int32_t i = 0; i < pInput[0].numOfRows; ++i) {
+    if (colDataIsNull_s(pInput[0].columnData, i)) {
+      colDataAppendNULL(pOutput->columnData, i);
+      continue;
+    }
+
+    switch(outputType) {
+      case TSDB_DATA_TYPE_BIGINT: {
+        if (inputType == TSDB_DATA_TYPE_BINARY) {
+          memcpy(output, varDataVal(input), varDataLen(input));
+          *(int64_t *)output = strtoll(output, NULL, 10);
+        } else if (inputType == TSDB_DATA_TYPE_NCHAR) {
+          char *newBuf = taosMemoryCalloc(1, outputLen * TSDB_NCHAR_SIZE + 1);
+          int32_t len  = taosUcs4ToMbs((TdUcs4 *)varDataVal(input), varDataLen(input), newBuf);
+          if (len < 0) {
+            taosMemoryFree(newBuf);
+            return TSDB_CODE_FAILED;
+          }
+          newBuf[len] = 0;
+          *(int64_t *)output = strtoll(newBuf, NULL, 10);
+          taosMemoryFree(newBuf);
+        } else {
+          GET_TYPED_DATA(*(int64_t *)output, int64_t, inputType, input);
+        }
+        break;
+      }
+      case TSDB_DATA_TYPE_UBIGINT: {
+        if (inputType == TSDB_DATA_TYPE_BINARY) {
+          memcpy(output, varDataVal(input), varDataLen(input));
+          *(uint64_t *)output = strtoull(output, NULL, 10);
+        } else if (inputType == TSDB_DATA_TYPE_NCHAR) {
+          char *newBuf = taosMemoryCalloc(1, outputLen * TSDB_NCHAR_SIZE + 1);
+          int32_t len = taosUcs4ToMbs((TdUcs4 *)varDataVal(input), varDataLen(input), newBuf);
+          if (len < 0) {
+            taosMemoryFree(newBuf);
+            return TSDB_CODE_FAILED;
+          }
+          newBuf[len] = 0;
+          *(uint64_t *)output = strtoull(newBuf, NULL, 10);
+          taosMemoryFree(newBuf);
+        } else {
+          GET_TYPED_DATA(*(uint64_t *)output, uint64_t, inputType, input);
+        }
+        break;
+      }
+      case TSDB_DATA_TYPE_TIMESTAMP: {
+        if (inputType == TSDB_DATA_TYPE_BINARY || inputType == TSDB_DATA_TYPE_NCHAR) {
+          //not support
+          return TSDB_CODE_FAILED;
+        } else {
+          GET_TYPED_DATA(*(int64_t *)output, int64_t, inputType, input);
+        }
+        break;
+      }
+      case TSDB_DATA_TYPE_BINARY: {
+        if (inputType == TSDB_DATA_TYPE_BOOL) {
+          int32_t len = sprintf(varDataVal(output), "%.*s", (int32_t)(outputLen - VARSTR_HEADER_SIZE), *(int8_t *)input ? "true" : "false");
+          varDataSetLen(output, len);
+        } else if (inputType == TSDB_DATA_TYPE_BINARY) {
+          int32_t len = sprintf(varDataVal(output), "%.*s", (int32_t)(outputLen - VARSTR_HEADER_SIZE), varDataVal(input));
+          varDataSetLen(output, len);
+        } else if (inputType == TSDB_DATA_TYPE_BINARY || inputType == TSDB_DATA_TYPE_NCHAR) {
+          //not support
+          return TSDB_CODE_FAILED;
+        } else {
+          char tmp[400] = {0};
+          NUM_TO_STRING(inputType, input, sizeof(tmp), tmp);
+          int32_t len = (int32_t)strlen(tmp);
+          len = (outputLen - VARSTR_HEADER_SIZE) > len ? len : (outputLen - VARSTR_HEADER_SIZE);
+          memcpy(varDataVal(output), tmp, len);
+          varDataSetLen(output, len);
+        }
+        break;
+      }
+      case TSDB_DATA_TYPE_NCHAR: {
+        int32_t outputCharLen = (outputLen - VARSTR_HEADER_SIZE) / TSDB_NCHAR_SIZE;
+        if (inputType == TSDB_DATA_TYPE_BOOL) {
+          char tmp[8] = {0};
+          int32_t len = sprintf(tmp, "%.*s", outputCharLen, *(int8_t *)input ? "true" : "false" );
+          bool ret = taosMbsToUcs4(tmp, len, (TdUcs4 *)varDataVal(output), outputLen - VARSTR_HEADER_SIZE, &len);
+          if (!ret) {
+            return TSDB_CODE_FAILED;
+          }
+          varDataSetLen(output, len);
+        } else if (inputType == TSDB_DATA_TYPE_BINARY) {
+          int32_t len = outputCharLen > varDataLen(input) ? varDataLen(input) : outputCharLen;
+          bool ret = taosMbsToUcs4(input + VARSTR_HEADER_SIZE, len, (TdUcs4 *)varDataVal(output), outputLen - VARSTR_HEADER_SIZE, &len);
+          if (!ret) {
+            return TSDB_CODE_FAILED;
+          }
+          varDataSetLen(output, len);
+        } else if (inputType == TSDB_DATA_TYPE_NCHAR) {
+          int32_t len = MIN(outputLen, varDataLen(input) + VARSTR_HEADER_SIZE);
+          memcpy(output, input, len);
+          varDataSetLen(output, len - VARSTR_HEADER_SIZE);
+        } else {
+          char tmp[400] = {0};
+          NUM_TO_STRING(inputType, input, sizeof(tmp), tmp);
+          int32_t len = (int32_t)strlen(tmp);
+          len = outputCharLen > len ? len : outputCharLen;
+          bool ret = taosMbsToUcs4(tmp, len, (TdUcs4 *)varDataVal(output), outputLen - VARSTR_HEADER_SIZE, &len);
+          if (!ret) {
+            return TSDB_CODE_FAILED;
+          }
+          varDataSetLen(output, len);
+        }
+        break;
+      }
+      default: {
+        return TSDB_CODE_FAILED;
+      }
+    }
+
+    colDataAppend(pOutput->columnData, i, output, false);
+    if (IS_VAR_DATA_TYPE(inputType)) {
+      input  += varDataTLen(input);
+    } else {
+      input  += tDataTypes[inputType].bytes;
+    }
+    if (IS_VAR_DATA_TYPE(outputType)) {
+      output += varDataTLen(output);
+    } else {
+      output += tDataTypes[outputType].bytes;
+    }
+  }
+
+  pOutput->numOfRows = pInput->numOfRows;
+  taosMemoryFree(outputBuf);
+  return TSDB_CODE_SUCCESS;
+}
 
 int32_t atanFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput) {
   return doScalarFunctionUnique(pInput, inputNum, pOutput, atan);