61 lines
1.7 KiB
Go
61 lines
1.7 KiB
Go
// Copyright 2024 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package tablesampler
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import (
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"unsafe"
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"github.com/pingcap/tidb/pkg/expression"
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"github.com/pingcap/tidb/pkg/parser/ast"
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"github.com/pingcap/tidb/pkg/table"
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"github.com/pingcap/tidb/pkg/util/size"
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)
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// TableSampleInfo contains the information for PhysicalTableSample.
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type TableSampleInfo struct {
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AstNode *ast.TableSample
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FullSchema *expression.Schema
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Partitions []table.PartitionedTable
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}
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// MemoryUsage return the memory usage of TableSampleInfo
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func (t *TableSampleInfo) MemoryUsage() (sum int64) {
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if t == nil {
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return
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}
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sum = size.SizeOfPointer*2 + size.SizeOfSlice + int64(cap(t.Partitions))*size.SizeOfInterface
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if t.AstNode != nil {
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sum += int64(unsafe.Sizeof(ast.TableSample{}))
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}
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if t.FullSchema != nil {
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sum += t.FullSchema.MemoryUsage()
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}
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return
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}
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// NewTableSampleInfo creates a new TableSampleInfo.
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func NewTableSampleInfo(node *ast.TableSample, fullSchema *expression.Schema,
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pt []table.PartitionedTable) *TableSampleInfo {
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if node == nil {
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return nil
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}
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return &TableSampleInfo{
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AstNode: node,
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FullSchema: fullSchema.Clone(),
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Partitions: pt,
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}
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}
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