Method parseUpdateAssignment

parser/parser_alter.go:934–957

Parse column = expression assignment

(pos Pos)

// Parse column = expression assignment
func (p *Parser) parseUpdateAssignment(pos Pos) (*UpdateAssignment, error) {
	column, err := p.ParseNestedIdentifier(p.Pos())
	if err != nil {
		return nil, err
	}

	if err := p.expectTokenKind(TokenKindSingleEQ); err != nil {
		return nil, err
	}

	// Why don't we use parseExpr here? Because `ALTER TABLE UPDATE` syntax allows to
	// use `IN PARTITION` keywords after assignments. So we need to limit the precedence
	// to avoid parsing `IN PARTITION` as part of the expression.
	expr, err := p.parseSubExpr(p.Pos(), precedenceIn)
	if err != nil {
		return nil, err
	}

	return &UpdateAssignment{
		AssignmentPos: pos,
		Column:        column,
		Expr:          expr,
	}, nil
}