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Support uuid_short in mysql mode.

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This commit is contained in:
al0
2021-11-30 11:13:10 +08:00
committed by LINxiansheng
parent d06570baf4
commit e28151b107
9 changed files with 143 additions and 4 deletions
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78
src/sql/engine/expr/ob_expr_uuid_short.cpp Normal file
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/*
* Copyright 2014-2021 Alibaba Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* ob_expr_uuid_short.cpp is for uuid_short function
*
* Date: 2021/8/20
*
* Authors:
* ailing.lcq<ailing.lcq@alibaba-inc.com>
*
*/
#define USING_LOG_PREFIX SQL_RESV
#include "sql/engine/expr/ob_expr_uuid_short.h"
#include "observer/ob_server_struct.h"
#include "lib/time/ob_time_utility.h"
using namespace oceanbase::common;
namespace oceanbase {
namespace sql {
ObExprUuidShort::ObExprUuidShort(ObIAllocator &alloc)
: ObFuncExprOperator(alloc, T_FUN_SYS_UUID_SHORT, N_UUID_SHORT, 0, NOT_ROW_DIMENSION)
{}
ObExprUuidShort::~ObExprUuidShort()
{}
/**
* Note:
* The total number of serverids over(>=) 256 will not guarantee uniqueness,
* but we will not report an error, because this is a undefined behavior in mysql.
* In short, users should need to know this.
*/
uint64_t ObExprUuidShort::generate_uuid_short()
{
// uuid_short
// | <8> | <32> | <24>
// server_id server_start_time incremented_variable
static volatile uint64_t server_id_and_server_startup_time = ((GCTX.server_id_ & 255) << 56) |
((static_cast<uint64_t>(common::ObTimeUtility::current_time() / 1000000) << 24) &
((static_cast<uint64_t>(1) << 56) - 1));
uint64_t uuid_short = ATOMIC_AAF(&server_id_and_server_startup_time, 1);
LOG_DEBUG("uuid_short generated.", K(uuid_short));
return uuid_short;
}
int ObExprUuidShort::calc_result0(common::ObObj &result, common::ObExprCtx &expr_ctx) const
{
int ret = OB_SUCCESS;
UNUSED(expr_ctx);
result.set_uint64(generate_uuid_short());
return ret;
}
int ObExprUuidShort::cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr, ObExpr &rt_expr) const
{
UNUSED(raw_expr);
UNUSED(expr_cg_ctx);
rt_expr.eval_func_ = ObExprUuidShort::eval_uuid_short;
return OB_SUCCESS;
}
int ObExprUuidShort::eval_uuid_short(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &expr_datum)
{
int ret = OB_SUCCESS;
UNUSED(expr);
UNUSED(ctx);
expr_datum.set_uint(generate_uuid_short());
return ret;
}
} // namespace sql
} // namespace oceanbase