release-22.2: collatedstring: support C and POSIX in expressions #97415
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Move the small amount of code from tree/collatedstring.go Release note: None
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rafiss
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otan
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Feb 21, 2023
Release note (sql change): Expressions of the form `COLLATE "default"`, `COLLATE "C"`, and `COLLATE "POSIX"` are now supported. Since the default collation cannot be changed currently, these expressions are all equivalent. The expressions are evaluated by treating the input as a normal string, and ignoring the collation. This means that comparisons between strings and collated strings that use "default", "C", or "POSIX" are now supported. Creating a column with the "C" or "POSIX" collations is still not supported.
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Backport 2/2 commits from #96828.
/cc @cockroachdb/release
Release justification: This blocks support for SQLAlchemy with psycopg3
fixes #50734
fixes #95667
informs #57255
collatedstring: create new package
Move the small amount of code from tree/collatedstring.go
collatedstring: support C and POSIX in expressions
Release note (sql change): Expressions of the form
COLLATE "default",COLLATE "C", andCOLLATE "POSIX"are now supported. Since thedefault collation cannot be changed currently, these expressions are all
equivalent. The expressions are evaluated by treating the input as a
normal string, and ignoring the collation.
This means that comparisons between strings and collated strings that
use "default", "C", or "POSIX" are now supported.
Creating a column with the "C" or "POSIX" collations is still not
supported.