69 lines
3.1 KiB
Go
69 lines
3.1 KiB
Go
// Copyright 2021 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 variable
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// Removed sysvars is a way of removing sysvars, while allowing limited
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// Parse-but-ignore support in SET context, and a more specific error in
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// SELECT @@varname context.
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//
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// This helps ensure some compatibility for applications while being
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// careful not to return dummy data.
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const (
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tiDBEnableAlterPlacement = "tidb_enable_alter_placement"
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tiDBMemQuotaHashJoin = "tidb_mem_quota_hashjoin"
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tiDBMemQuotaMergeJoin = "tidb_mem_quota_mergejoin"
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tiDBMemQuotaSort = "tidb_mem_quota_sort"
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tiDBMemQuotaTopn = "tidb_mem_quota_topn"
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tiDBMemQuotaIndexLookupReader = "tidb_mem_quota_indexlookupreader"
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tiDBMemQuotaIndexLookupJoin = "tidb_mem_quota_indexlookupjoin"
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tiDBEnableGlobalTemporaryTable = "tidb_enable_global_temporary_table"
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tiDBSlowLogMasking = "tidb_slow_log_masking"
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placementChecks = "placement_checks"
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tiDBEnableStreaming = "tidb_enable_streaming"
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tiDBOptBCJ = "tidb_opt_broadcast_join"
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tidbEnableChangeMultiSchema = "tidb_enable_change_multi_schema"
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)
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var removedSysVars = map[string]string{
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tiDBEnableAlterPlacement: "alter placement is now always enabled",
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tiDBEnableGlobalTemporaryTable: "temporary table support is now always enabled",
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tiDBSlowLogMasking: "use tidb_redact_log instead",
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placementChecks: "placement_checks is removed and use tidb_placement_mode instead",
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tiDBMemQuotaHashJoin: "use tidb_mem_quota_query instead",
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tiDBMemQuotaMergeJoin: "use tidb_mem_quota_query instead",
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tiDBMemQuotaSort: "use tidb_mem_quota_query instead",
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tiDBMemQuotaTopn: "use tidb_mem_quota_query instead",
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tiDBMemQuotaIndexLookupReader: "use tidb_mem_quota_query instead",
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tiDBMemQuotaIndexLookupJoin: "use tidb_mem_quota_query instead",
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tiDBEnableStreaming: "streaming is no longer supported",
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tiDBOptBCJ: "tidb_opt_broadcast_join is removed and use tidb_allow_mpp instead",
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tidbEnableChangeMultiSchema: "alter multiple schema objects in a table is now always enabled",
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}
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// IsRemovedSysVar returns true if the sysvar has been removed
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func IsRemovedSysVar(varName string) bool {
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_, ok := removedSysVars[varName]
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return ok
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}
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// CheckSysVarIsRemoved returns an error if the sysvar has been removed
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func CheckSysVarIsRemoved(varName string) error {
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if reason, ok := removedSysVars[varName]; ok {
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return ErrVariableNoLongerSupported.GenWithStackByArgs(varName, reason)
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}
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return nil
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}
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