tvariant.h

/*
 * 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/>.
 */

#ifndef TDENGINE_TVARIANT_H
#define TDENGINE_TVARIANT_H

#ifdef __cplusplus
extern "C" {
#endif

#include "tarray.h"

// variant, each number/string/field_id has a corresponding struct during parsing sql
typedef struct SVariant {
  uint32_t   nType;
  int32_t    nLen;  // only used for string, for number, it is useless
  union {
    int64_t  i64;
    uint64_t u64;
    double   d;
    char    *pz;
    wchar_t *wpz;
    SArray  *arr; // only for 'in' query to hold value list, not value for a field
  };
} SVariant;

bool taosVariantIsValid(SVariant *pVar);

void taosVariantCreate(SVariant *pVar, char* z, int32_t n, int32_t type);

void taosVariantCreateFromBinary(SVariant *pVar, const char *pz, size_t len, uint32_t type);

void taosVariantDestroy(SVariant *pV);

void taosVariantAssign(SVariant *pDst, const SVariant *pSrc);

int32_t taosVariantCompare(const SVariant* p1, const SVariant* p2);

int32_t taosVariantToString(SVariant *pVar, char *dst);

int32_t taosVariantDump(SVariant *pVariant, char *payload, int16_t type, bool includeLengthPrefix);

#if 0
int32_t taosVariantDumpEx(SVariant *pVariant, char *payload, int16_t type, bool includeLengthPrefix, bool *converted, char *extInfo);
#endif

int32_t taosVariantTypeSetType(SVariant *pVariant, char type);

#ifdef __cplusplus
}
#endif

#endif  // TDENGINE_TVARIANT_H