Method parseAlterTableDropClause

parser/parser_alter.go:410–453

(pos Pos)

}

func (p *Parser) parseAlterTableDropClause(pos Pos) (AlterTableClause, error) {
	var kind string
	switch {
	case p.matchKeyword(KeywordColumn):
		kind = KeywordColumn
	case p.matchKeyword(KeywordIndex):
		kind = KeywordIndex
	case p.matchKeyword(KeywordProjection):
		kind = KeywordProjection
	default:
		return nil, fmt.Errorf("expected token: COLUMN|INDEX|PROJECTION, but got %s", p.lastTokenKind())
	}
	_ = p.lexer.consumeToken()

	ifExists, err := p.tryParseIfExists()
	if err != nil {
		return nil, err
	}

	name, err := p.ParseNestedIdentifier(p.Pos())
	if err != nil {
		return nil, err
	}

	if kind == KeywordProjection {
		return &AlterTableDropProjection{
			DropPos:        pos,
			ProjectionName: name,
			IfExists:       ifExists,
		}, nil
	} else if kind == KeywordColumn {
		return &AlterTableDropColumn{
			DropPos:    pos,
			ColumnName: name,
			IfExists:   ifExists,
		}, nil
	} else {
		return &AlterTableDropIndex{
			DropPos:   pos,
			IndexName: name,
			IfExists:  ifExists,
		}, nil
	}
}

func (p *Parser) tryParseAfterClause() (*NestedIdentifier, error) {
	if !p.tryConsumeKeywords(KeywordAfter) {