Method canBeAlias

pkg/sql/parser/parser.go:1087–1092

canBeAlias checks if current token can be used as an alias. Aliases can be IDENT, double-quoted identifiers, or certain non-reserved keywords, but NOT contextual clause keywords that would be consumed as aliases by mistake (e.g. MINUS in Snowflake/Oracle, QUALIFY in Snowflake/BigQuery).

()

// but NOT contextual clause keywords that would be consumed as aliases by mistake
// (e.g. MINUS in Snowflake/Oracle, QUALIFY in Snowflake/BigQuery).
func (p *Parser) canBeAlias() bool {
	if p.isMinusSetOp() || p.isQualifyKeyword() {
		return false
	}
	return p.isIdentifier() || p.isNonReservedKeyword()
}

// parseAlterTableStmt is a simplified version for the parser implementation
// It delegates to the more comprehensive parseAlterStatement in alter.go