Method parsePeriodDefinition

pkg/sql/parser/mariadb.go:440–480

parsePeriodDefinition parses: PERIOD FOR name (start_col, end_col) The caller positions the parser at the PERIOD keyword; this function advances past it.

()

// parsePeriodDefinition parses: PERIOD FOR name (start_col, end_col)
// The caller positions the parser at the PERIOD keyword; this function advances past it.
func (p *Parser) parsePeriodDefinition() (*ast.PeriodDefinition, error) {
	// current token is PERIOD; advance past it
	p.advance()
	if !strings.EqualFold(p.currentToken.Token.Value, "FOR") {
		return nil, p.expectedError("FOR")
	}
	p.advance()

	// Use parseColumnName so that reserved-keyword period names like SYSTEM_TIME are accepted.
	name := p.parseColumnName()
	if name == nil || name.Name == "" {
		return nil, p.expectedError("period name")
	}

	if !p.isType(models.TokenTypeLParen) {
		return nil, p.expectedError("(")
	}
	p.advance()

	startCol := p.parseIdent()
	if startCol == nil || startCol.Name == "" {
		return nil, p.expectedError("start column name")
	}

	if !p.isType(models.TokenTypeComma) {
		return nil, p.expectedError(",")
	}
	p.advance()

	endCol := p.parseIdent()
	if endCol == nil || endCol.Name == "" {
		return nil, p.expectedError("end column name")
	}

	if !p.isType(models.TokenTypeRParen) {
		return nil, p.expectedError(")")
	}
	p.advance()

	return &ast.PeriodDefinition{Name: name, StartCol: startCol, EndCol: endCol}, nil
}