Method parseAlterTableModify

parser/parser_alter.go:639–697

(pos Pos)

}

func (p *Parser) parseAlterTableModify(pos Pos) (AlterTableClause, error) {
	if err := p.expectKeyword(KeywordModify); err != nil {
		return nil, err
	}

	switch {
	case p.matchKeyword(KeywordColumn):
		return p.parseAlterTableModifyColumn(pos)
	case p.matchKeyword(KeywordTtl):
		ttlPos := p.Pos()
		_ = p.lexer.consumeToken()
		items, err := p.parseTTLClause(ttlPos, true)
		if err != nil {
			return nil, err
		}
		listEnd := ttlPos
		if len(items) > 0 {
			listEnd = items[len(items)-1].End()
		}
		ttlClause := &TTLClause{
			TTLPos:  ttlPos,
			ListEnd: listEnd,
			Items:   items,
		}
		return &AlterTableModifyTTL{
			ModifyPos:    pos,
			StatementEnd: ttlClause.End(),
			TTL:          ttlClause,
		}, nil
	case p.matchKeyword(KeywordQuery):
		_ = p.lexer.consumeToken()
		selectQuery, err := p.parseSelectQuery(pos)
		if err != nil {
			return nil, err
		}
		return &AlterTableModifyQuery{
			ModifyPos:    pos,
			StatementEnd: selectQuery.End(),
			SelectExpr:   selectQuery,
		}, nil
	case p.matchKeyword(KeywordSetting):
		_ = p.lexer.consumeToken() // consume "SETTING"
		settings, err := p.parseSettingsList(p.Pos())
		if err != nil {
			return nil, err
		}
		// settings must not be empty
		statementEnd := settings[len(settings)-1].End()
		return &AlterTableModifySetting{
			ModifyPos:    pos,
			StatementEnd: statementEnd,
			Settings:     settings,
		}, nil
	default:
		return nil, fmt.Errorf("expected keyword: COLUMN|TTL|QUERY|SETTING, but got %q",
			p.last().String)
	}