/// <summary>
/// Translates custom methods like <see cref="RelationalQueryableExtensions.AsSubQuery{TEntity}"/>.
/// </summary>
/// <param name="visitor">The visitor.</param>
/// <param name="methodCallExpression">Method call to translate.</param>
/// <returns>Translated method call if a custom method is found; otherwise <c>null</c>.</returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="visitor"/> or <paramref name="methodCallExpression"/> is <c>null</c>.
/// </exception>
public static ShapedQueryExpression?TranslateCustomMethods(this RelationalQueryableMethodTranslatingExpressionVisitor visitor, MethodCallExpression methodCallExpression)
{
if (visitor == null)
{
throw new ArgumentNullException(nameof(visitor));
}
if (methodCallExpression == null)
{
throw new ArgumentNullException(nameof(methodCallExpression));
}
if (methodCallExpression.Method.DeclaringType == typeof(RelationalQueryableExtensions) &&
methodCallExpression.Method.Name == nameof(RelationalQueryableExtensions.AsSubQuery))
{
var expression = visitor.Visit(methodCallExpression.Arguments[0]);
if (expression is ShapedQueryExpression shapedQueryExpression)
{
((SelectExpression)shapedQueryExpression.QueryExpression).PushdownIntoSubquery();
return(shapedQueryExpression);
}
}
return(null);
}
public RelationalProjectionBindingExpressionVisitor(
[NotNull] RelationalQueryableMethodTranslatingExpressionVisitor queryableMethodTranslatingExpressionVisitor,
[NotNull] RelationalSqlTranslatingExpressionVisitor sqlTranslatingExpressionVisitor)
{
_queryableMethodTranslatingExpressionVisitor = queryableMethodTranslatingExpressionVisitor;
_sqlTranslator = sqlTranslatingExpressionVisitor;
}
public RelationalProjectionBindingExpressionVisitor(
[NotNull] RelationalQueryableMethodTranslatingExpressionVisitor queryableMethodTranslatingExpressionVisitor,
[NotNull] RelationalSqlTranslatingExpressionVisitor sqlTranslatingExpressionVisitor)
{
_queryableMethodTranslatingExpressionVisitor = queryableMethodTranslatingExpressionVisitor;
_sqlTranslator = sqlTranslatingExpressionVisitor;
_includeFindingExpressionVisitor = new IncludeFindingExpressionVisitor();
_selectExpression = null !;
_existingProjections = Array.Empty <SqlExpression>();
}
protected ClickHouseQueryableMethodTranslatingExpressionVisitor(RelationalQueryableMethodTranslatingExpressionVisitor parentVisitor)
: base(parentVisitor)
{
}
