sessionctx/variable: open batch_cop for tiflash by default (#18190) #18552
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Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
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cherry-pick #18190 to release-4.0
What problem does this PR solve?
Open tidb_allow_batch_cop by default and test report is https://docs.google.com/document/d/1uZqfNWwha4317sMGF92R2xovJAZCV1EWSIjhrVd0BB0/edit
Problem Summary:
batch cop is added by #16030 and its doc is pingcap/docs-cn#3265
After POC for a long time, we decide to open this feature by default.
What's Changed:
Only a default value for variable is changed.
Side effects
Release note
active tidb_allow_batch_cop by default.