expression: fix compare string with hex string literal makes tidb panic#26964

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xiongjiwei wants to merge 3 commits intopingcap:masterfrom xiongjiwei:compare-binary-panic

+93-24

Commits on Aug 9, 2021

fix compare string with hex string literal panic
xiongjiwei
committed

Commits on Aug 10, 2021

fix the comments
xiongjiwei
committed

Commits on Aug 12, 2021

add more test
xiongjiwei
committed