Method writeExpression

runtime/metricsview/astexpr.go:43–60

writeExpression writes the SQL expression for the given expression. The output is guaranteed to be wrapped in parentheses.

(e *Expression)

// writeExpression writes the SQL expression for the given expression.
// The output is guaranteed to be wrapped in parentheses.
func (b *sqlExprBuilder) writeExpression(e *Expression) error {
	if e == nil {
		return nil
	}
	if e.Name != "" {
		return b.writeName(e.Name)
	}
	if e.Value != nil {
		return b.writeValue(e.Value)
	}
	if e.Subquery != nil {
		return b.writeSubquery(e.Subquery)
	}
	if e.Condition != nil {
		return b.writeCondition(e.Condition)
	}
	return errors.New("invalid expression (must contain one of name, val, cond, subquery)")
}

func (b *sqlExprBuilder) writeName(name string) error {
	expr, unnest, _, err := b.sqlForName(name)