computed index by substring function for long columns
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Key: CORE-3672
URL: http://tracker.firebirdsql.org/browse/CORE-3672
Project: Firebird Core
Issue Type: Bug
Affects Versions: 2.1.4
Environment: win32
Reporter: Lukas Masak
Priority: Minor
It is not possible to use substring function to create computed index for large
columns.
CREATE INDEX IDX1 ON tbl_test COMPUTED BY (SUBSTRING(col1 from 1 for 20))
will fail with message: key size exceeds implementation restriction for index
"IDX1"
select char_length( SUBSTRING(col1 from 1 for 20)) from tbl_test returns
20 so I was expecting index to work.
workaround
CREATE INDEX IDX1 ON tbl_test COMPUTED BY (CAST(SUBSTRING(col1 from 1 for 20)
as varchar(20)))
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