Method parseExplainStmt

parser/parser_query.go:1241–1266

(pos Pos)

}

func (p *Parser) parseExplainStmt(pos Pos) (*ExplainStmt, error) {
	if err := p.expectKeyword(KeywordExplain); err != nil {
		return nil, err
	}

	var explainType string
	switch {
	case p.matchKeyword(KeywordSyntax),
		p.matchKeyword(KeywordPipeline),
		p.matchKeyword(KeywordEstimate),
		p.matchKeyword(KeywordAst):
		explainType = p.last().String
		_ = p.lexer.consumeToken()
	default:
		return nil, fmt.Errorf("expected SYNTAX, PIPELINE, ESTIMATE or AST, got %s", p.lastTokenKind())
	}
	stmt, err := p.parseSelectQuery(p.Pos())
	if err != nil {
		return nil, err
	}
	return &ExplainStmt{
		ExplainPos: pos,
		Type:       explainType,
		Statement:  stmt,
	}, nil
}