58 lines
2.1 KiB
Go
58 lines
2.1 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 contextopt
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import (
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"github.com/pingcap/tidb/pkg/expression/context"
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"github.com/pingcap/tidb/pkg/sessionctx/variable"
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"github.com/pingcap/tidb/pkg/util/intest"
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)
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var _ context.OptionalEvalPropProvider = &SessionVarsPropProvider{}
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var _ RequireOptionalEvalProps = SessionVarsPropReader{}
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// SessionVarsPropProvider is a provider to get the session variables
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type SessionVarsPropProvider struct {
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variable.SessionVarsProvider
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}
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// NewSessionVarsProvider returns a new SessionVarsPropProvider
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func NewSessionVarsProvider(provider variable.SessionVarsProvider) *SessionVarsPropProvider {
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intest.AssertNotNil(provider)
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return &SessionVarsPropProvider{provider}
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}
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// Desc implements the OptionalEvalPropProvider interface.
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func (p *SessionVarsPropProvider) Desc() *context.OptionalEvalPropDesc {
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return context.OptPropSessionVars.Desc()
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}
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// SessionVarsPropReader is used by expression to read property context.OptPropSessionVars
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type SessionVarsPropReader struct{}
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// RequiredOptionalEvalProps implements the RequireOptionalEvalProps interface.
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func (SessionVarsPropReader) RequiredOptionalEvalProps() context.OptionalEvalPropKeySet {
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return context.OptPropSessionVars.AsPropKeySet()
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}
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// GetSessionVars returns the session vars from the context
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func (SessionVarsPropReader) GetSessionVars(ctx context.EvalContext) (*variable.SessionVars, error) {
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p, err := getPropProvider[*SessionVarsPropProvider](ctx, context.OptPropSessionVars)
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if err != nil {
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return nil, err
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}
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return p.GetSessionVars(), nil
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}
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