// SanitizeDefaultExpr verifies a default expression is valid and has the
// correct type.
func SanitizeDefaultExpr(expr parser.Expr, colDatumType parser.Datum) error {
typedExpr, err := parser.TypeCheck(expr, nil, colDatumType)
if err != nil {
return err
}
if defaultType := typedExpr.ReturnType(); !colDatumType.TypeEqual(defaultType) {
return incompatibleColumnDefaultTypeError(colDatumType, defaultType)
}
if parser.ContainsVars(typedExpr) {
return defaultContainsPlaceholdersError(typedExpr)
}
return nil
}
// SanitizeVarFreeExpr verifies a default expression is valid, has the
// correct type and contains no variable expressions.
func SanitizeVarFreeExpr(expr parser.Expr, expectedType parser.Datum, context string) error {
if parser.ContainsVars(expr) {
return exprContainsVarsError(context, expr)
}
typedExpr, err := parser.TypeCheck(expr, nil, expectedType)
if err != nil {
return err
}
if defaultType := typedExpr.ReturnType(); !expectedType.TypeEqual(defaultType) {
return incompatibleExprTypeError(context, expectedType, defaultType)
}
return nil
}