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Cardinality always 0 #26944

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311ybb opened this issue Aug 5, 2021 · 2 comments · Fixed by pingcap/docs-cn#7261
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Cardinality always 0 #26944

311ybb opened this issue Aug 5, 2021 · 2 comments · Fixed by pingcap/docs-cn#7261
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severity/major sig/planner SIG: Planner type/bug The issue is confirmed as a bug.

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@311ybb
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311ybb commented Aug 5, 2021

INFORMATION_SCHEMA.STATISTICS and SHOW INDEX From xxx column 'Cardinality' always 0, even after analyze table executed.
@morgo morgo added type/bug The issue is confirmed as a bug. sig/sql-infra SIG: SQL Infra labels Aug 6, 2021
@djshow832 djshow832 added sig/planner SIG: Planner and removed sig/sql-infra SIG: SQL Infra labels Aug 6, 2021
@ichn-hu ichn-hu mentioned this issue Aug 6, 2021
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Our current implementation doesn't use these interfaces to display cardinality. We'll update our documents to reflect this.
You can use the SHOW STATS_META statement to get the row count of a table.

@time-and-fate time-and-fate mentioned this issue Oct 13, 2021
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Please check whether the issue should be labeled with 'affects-x.y' or 'fixes-x.y.z', and then remove 'needs-more-info' label.

This was referenced Oct 19, 2021
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Fix and improve some descriptions about optimizer time-and-fate/docs-cn
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@morgo @jebter @time-and-fate @djshow832 @311ybb