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planner: fix a sporadic panic due to the PR #7684 when using the prepared plan cache #7956

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merged 1 commit into from
Oct 29, 2018
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planner: fix a sporadic panic due to the PR #7684 when using the prepared plan cache #7956

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4 changes: 4 additions & 0 deletions executor/prepared.go
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Original file line number Diff line number Diff line change
Expand Up @@ -125,6 +125,10 @@ func (e *PrepareExec) Next(ctx context.Context, chk *chunk.Chunk) error {
if _, ok := stmt.(ast.DDLNode); ok {
return ErrPrepareDDL
}
err = ResetContextOfStmt(e.ctx, stmt)
if err != nil {
return err
}
var extractor paramMarkerExtractor
stmt.Accept(&extractor)

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3 changes: 2 additions & 1 deletion tidb-server/main.go
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Expand Up @@ -399,7 +399,8 @@ func setGlobalVars() {
variable.SysVars[variable.TIDBMemQuotaQuery].Value = strconv.FormatInt(cfg.MemQuotaQuery, 10)
variable.SysVars["lower_case_table_names"].Value = strconv.Itoa(cfg.LowerCaseTableNames)

plannercore.SetPreparedPlanCache(cfg.PreparedPlanCache.Enabled)
// For CI environment we default enable prepare-plan-cache.
plannercore.SetPreparedPlanCache(config.CheckTableBeforeDrop || cfg.PreparedPlanCache.Enabled)
if plannercore.PreparedPlanCacheEnabled() {
plannercore.PreparedPlanCacheCapacity = cfg.PreparedPlanCache.Capacity
}
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