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parse_clause.c

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    • Robert Haas's avatar
      8f9fe6ed
      Add notion of a "transform function" that can simplify function calls. · 8f9fe6ed
      Robert Haas authored 
      Initially, we use this only to eliminate calls to the varchar()
function in cases where the length is not being reduced and, therefore,
the function call is equivalent to a RelabelType operation.  The most
significant effect of this is that we can avoid a table rewrite when
changing a varchar(X) column to a varchar(Y) column, where Y > X.

Noah Misch, reviewed by me and Alexey Klyukin
      8f9fe6ed
      History
      Add notion of a "transform function" that can simplify function calls.
      Robert Haas authored 
      Initially, we use this only to eliminate calls to the varchar()
function in cases where the length is not being reduced and, therefore,
the function call is equivalent to a RelabelType operation.  The most
significant effect of this is that we can avoid a table rewrite when
changing a varchar(X) column to a varchar(Y) column, where Y > X.

Noah Misch, reviewed by me and Alexey Klyukin