release-20.1: sql: return the proper type length for "char" type #48642
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Backport 1/1 commits from #48602.
/cc @cockroachdb/release
Previously, the "char" type was reported as a varlen datatype. However,
it's actually a fixed-length datatype with size 1. This commit changes
the reporting to be accurate.
Closes #48565.
Release note (sql change): correctly report type length for "char" type