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Support DROP CONSTRAINT [ IF EXISTS ] <name> [ CASCADE ] (#396)

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* adding support for DROP CONSTRAINT [ IF EXISTS ] <name>

* implementing [ CASCADE ] for DROP CONSTRAINT
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tvallotton 2022-02-08 12:34:09 -03:00 • committed by GitHub
parent e4959696b5
commit c4cbc8340a
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3 changed files with 76 additions and 3 deletions
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9
src/parser.rs
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@ -2030,6 +2030,15 @@ impl<'a> Parser<'a> {
partitions,
if_exists: false,
}
} else if self.parse_keyword(Keyword::CONSTRAINT) {
let if_exists = self.parse_keywords(&[Keyword::IF, Keyword::EXISTS]);
let name = self.parse_identifier()?;
let cascade = self.parse_keyword(Keyword::CASCADE);
AlterTableOperation::DropConstraint {
if_exists,
name,
cascade,
}
} else {
let _ = self.parse_keyword(Keyword::COLUMN);
let if_exists = self.parse_keywords(&[Keyword::IF, Keyword::EXISTS]);