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Add SQL functions for Unicode normalization

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This adds SQL expressions NORMALIZE() and IS NORMALIZED to convert and
check Unicode normal forms, per SQL standard.

To support fast IS NORMALIZED tests, we pull in a new data file
DerivedNormalizationProps.txt from Unicode and build a lookup table
from that, using techniques similar to ones already used for other
Unicode data.  make update-unicode will keep it up to date.  We only
build and use these tables for the NFC and NFKC forms, because they
are too big for NFD and NFKD and the improvement is not significant
enough there.

Reviewed-by: Daniel Verite <daniel@manitou-mail.org>
Reviewed-by: Andreas Karlsson <andreas@proxel.se>
Discussion: https://www.postgresql.org/message-id/flat/c1909f27-c269-2ed9-12f8-3ab72c8caf7a@2ndquadrant.com
This commit is contained in:
Peter Eisentraut
2020-03-26 08:14:00 +01:00
parent 070c3d3937
commit 2991ac5fc9
20 changed files with 6764 additions and 7 deletions
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src/backend/catalog/sql_features.txt
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@@ -257,7 +257,7 @@ F386 Set identity column generation clause YES
F391 Long identifiers YES
F392 Unicode escapes in identifiers YES
F393 Unicode escapes in literals YES
F394 Optional normal form specification NO
F394 Optional normal form specification YES
F401 Extended joined table YES
F401 Extended joined table 01 NATURAL JOIN YES
F401 Extended joined table 02 FULL OUTER JOIN YES