builtins.c

/*
 * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
 *
 * This program is free software: you can use, redistribute, and/or modify
 * it under the terms of the GNU Affero General Public License, version 3
 * or later ("AGPL"), as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include "builtins.h"
#include "builtinsimpl.h"
#include "taoserror.h"
#include "tdatablock.h"

int32_t stubCheckAndGetResultType(SFunctionNode* pFunc);

const SBuiltinFuncDefinition funcMgtBuiltins[] = {
  {
    .name = "count",
    .type = FUNCTION_TYPE_COUNT,
    .classification = FUNC_MGT_AGG_FUNC,
    .checkFunc    = stubCheckAndGetResultType,
    .getEnvFunc   = getCountFuncEnv,
    .initFunc     = functionSetup,
    .processFunc  = countFunction,
    .finalizeFunc = functionFinalizer
  },
  {
    .name = "sum",
    .type = FUNCTION_TYPE_SUM,
    .classification = FUNC_MGT_AGG_FUNC,
    .checkFunc    = stubCheckAndGetResultType,
    .getEnvFunc   = getSumFuncEnv,
    .initFunc     = functionSetup,
    .processFunc  = sumFunction,
    .finalizeFunc = functionFinalizer
  },
  {
    .name = "min",
    .type = FUNCTION_TYPE_MIN,
    .classification = FUNC_MGT_AGG_FUNC,
    .checkFunc    = stubCheckAndGetResultType,
    .getEnvFunc   = getMinmaxFuncEnv,
    .initFunc     = minFunctionSetup,
    .processFunc  = minFunction,
    .finalizeFunc = functionFinalizer
  },
  {
    .name = "max",
    .type = FUNCTION_TYPE_MAX,
    .classification = FUNC_MGT_AGG_FUNC,
    .checkFunc    = stubCheckAndGetResultType,
    .getEnvFunc   = getMinmaxFuncEnv,
    .initFunc     = maxFunctionSetup,
    .processFunc  = maxFunction,
    .finalizeFunc = functionFinalizer
  },
  {
    .name = "concat",
    .type = FUNCTION_TYPE_CONCAT,
    .classification = FUNC_MGT_SCALAR_FUNC | FUNC_MGT_STRING_FUNC,
    .checkFunc    = stubCheckAndGetResultType,
    .getEnvFunc   = NULL,
    .initFunc     = NULL,
    .sprocessFunc = NULL,
    .finalizeFunc = NULL
  }
};

const int32_t funcMgtBuiltinsNum = (sizeof(funcMgtBuiltins) / sizeof(SBuiltinFuncDefinition));

int32_t stubCheckAndGetResultType(SFunctionNode* pFunc) {
  switch(pFunc->funcType) {
    case FUNCTION_TYPE_COUNT:
      pFunc->node.resType = (SDataType){.bytes = sizeof(int64_t), .type = TSDB_DATA_TYPE_BIGINT};
      break;
    case FUNCTION_TYPE_SUM: {
      SColumnNode* pParam = nodesListGetNode(pFunc->pParameterList, 0);
      int32_t paraType = pParam->node.resType.type;

      int32_t resType  = 0;
      if (IS_SIGNED_NUMERIC_TYPE(paraType)) {
        resType = TSDB_DATA_TYPE_BIGINT;
      } else if (IS_UNSIGNED_NUMERIC_TYPE(paraType)) {
        resType = TSDB_DATA_TYPE_UBIGINT;
      } else if (IS_FLOAT_TYPE(paraType)) {
        resType = TSDB_DATA_TYPE_DOUBLE;
      } else {
        ASSERT(0);
      }

      pFunc->node.resType = (SDataType) { .bytes = tDataTypes[resType].bytes, .type = resType };
      break;
    }
    case FUNCTION_TYPE_MIN:
    case FUNCTION_TYPE_MAX: {
      SColumnNode* pParam = nodesListGetNode(pFunc->pParameterList, 0);
      int32_t paraType = pParam->node.resType.type;
      pFunc->node.resType = (SDataType) { .bytes = tDataTypes[paraType].bytes, .type = paraType };
      break;
    }
    case FUNCTION_TYPE_CONCAT:
      // todo
      break;
    default:
      ASSERT(0); // to found the fault ASAP.
  }

  return TSDB_CODE_SUCCESS;
}