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|| (string concatenator)
Result type VARCHAR
Changed in: 2.0
Description
The result type of string concatenations used to be CHAR(n). Starting with Firebird 2.0, it is VARCHAR(n). As a result, the maximum length of a concatenation outcome is now 32765 instead of 32767.
Overflow checking
Changed in: 1.0, 2.0
Description
In Firebird versions 1.x, an error would be raised if the sum of the declared string lengths in a concatenation exceeded 65535 bytes, even if the actual result lay within the maximum string length of 32767 bytes. In Firebird 2.0 and up, the declared string lengths will never cause an error. Only if the actual outcome exceeds 32765 bytes (the new limit for concatenation results) will an error be raised.