expression: fix painc on substring_index (#7806) #7896
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zz-jason
added
type/bugfix
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/run-all-tests tidb-test=release-2.0 tikv=release-2.0 pd=release-2.0 |
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/run-unit-test tidb-test=release-2.0 tikv=release-2.0 pd=release-2.0 |
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/run-all-tests tidb-test=release-2.0 tikv=release-2.0 pd=release-2.0 |
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What problem does this PR solve?
cherry pick #7806 to release 2.0
What is changed and how it works?
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Tests
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