Optimize load data assignment expressions #46081
Labels
affects-6.5
affects-7.1
sig/execution
SIG execution
type/enhancement
The issue or PR belongs to an enhancement.
Enhancement
According to the above CPU flame graph, most of the time spends on
rewriteAstExpr
.The root cause is that the ASTs of assignment expressions in
load data
are rewritten for each row, which may make theload data
super slow.#43492 has already fixed this issue, but only the TiDB clusters whose versions are greater than or equal to v7.2 contain this pr. In addition, there are some PR for
load data
code refactoring in v7.1.So a tiny fix for this issue is needed for the previous TiDB version.
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