forked from cockroachdb/cockroach
/
decimal.go
42 lines (39 loc) · 1.44 KB
/
decimal.go
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// Copyright 2016 The Cockroach Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License.
package parser
import "github.com/cockroachdb/apd"
var (
// DecimalCtx is the default context for decimal operations. Any change
// in the exponent limits must still guarantee a safe conversion to the
// postegrs binary decimal format in the wire protocol, which uses an
// int16. See pgwire/types.go.
DecimalCtx = &apd.Context{
Precision: 20,
Rounding: apd.RoundHalfUp,
MaxExponent: 2000,
MinExponent: -2000,
Traps: apd.DefaultTraps,
}
// ExactCtx is a decimal context with exact precision.
ExactCtx = DecimalCtx.WithPrecision(0)
// HighPrecisionCtx is a decimal context with high precision.
HighPrecisionCtx = DecimalCtx.WithPrecision(2000)
// RoundCtx is a decimal context with high precision and RoundHalfEven
// rounding.
RoundCtx = func() *apd.Context {
ctx := *HighPrecisionCtx
ctx.Rounding = apd.RoundHalfEven
return &ctx
}()
)