release-20.2: sql: fix a panic when showing statistics on a table with enums #58413
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Backport 1/1 commits from #58251.
/cc @cockroachdb/release
Fixes #58220.
The panic was caused by using a user defined type without hydration of
type metadata.
Release note (bug fix): Fix a internal panic when using the
SHOW STATISTICS USING JSON
statement on a table containing ENUM types.