tidb partition_prune 源码
tidb partition_prune 代码
文件路径：/planner/core/partition_prune.go
// Copyright 2020 PingCAP, Inc.
//
// 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 core
import (
"github.com/pingcap/tidb/expression"
"github.com/pingcap/tidb/parser/model"
"github.com/pingcap/tidb/sessionctx"
"github.com/pingcap/tidb/table"
"github.com/pingcap/tidb/types"
)
// PartitionPruning finds all used partitions according to query conditions, it will
// return nil if condition match none of partitions. The return value is a array of the
// idx in the partition definitions array, use pi.Definitions[idx] to get the partition ID
func PartitionPruning(ctx sessionctx.Context, tbl table.PartitionedTable, conds []expression.Expression, partitionNames []model.CIStr,
columns []*expression.Column, names types.NameSlice) ([]int, error) {
s := partitionProcessor{}
pi := tbl.Meta().Partition
switch pi.Type {
case model.PartitionTypeHash:
return s.pruneHashPartition(ctx, tbl, partitionNames, conds, columns, names)
case model.PartitionTypeRange:
rangeOr, err := s.pruneRangePartition(ctx, pi, tbl, conds, columns, names)
if err != nil {
return nil, err
}
ret := s.convertToIntSlice(rangeOr, pi, partitionNames)
return ret, nil
case model.PartitionTypeList:
return s.pruneListPartition(ctx, tbl, partitionNames, conds)
}
return []int{FullRange}, nil
}
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