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distinct.go
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distinct.go
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/*
Copyright 2020 The Vitess 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 planbuilder
import (
"vitess.io/vitess/go/vt/vtgate/engine"
)
var _ logicalPlan = (*distinct)(nil)
// distinct is the logicalPlan for engine.Distinct.
type distinct struct {
logicalPlanCommon
checkCols []engine.CheckCol
truncateColumn int
// needToTruncate is the old way to check weight_string column and set truncation.
needToTruncate bool
}
func newDistinct(source logicalPlan, checkCols []engine.CheckCol, truncateColumn int) logicalPlan {
return &distinct{
logicalPlanCommon: newBuilderCommon(source),
checkCols: checkCols,
truncateColumn: truncateColumn,
}
}
func (d *distinct) Primitive() engine.Primitive {
truncate := d.truncateColumn
if d.needToTruncate {
wsColFound := false
for _, col := range d.checkCols {
if col.WsCol != nil {
wsColFound = true
break
}
}
if wsColFound {
truncate = len(d.checkCols)
}
}
return &engine.Distinct{
Source: d.input.Primitive(),
CheckCols: d.checkCols,
Truncate: truncate,
}
}