/// <summary>
/// Adds an INCLUDE clause to the index definition with property names from the specified expression.
/// This clause specifies a list of columns which will be included as a non-key part in the index.
/// </summary>
/// <remarks>
/// https://www.postgresql.org/docs/current/sql-createindex.html
/// </remarks>
/// <param name="indexBuilder"> The builder for the index being configured. </param>
/// <param name="includeExpression">
/// <para>
/// A lambda expression representing the property(s) to be included in the INCLUDE clause
/// (<c>blog => blog.Url</c>).
/// </para>
/// <para>
/// If multiple properties are to be included then specify an anonymous type including the
/// properties (<c>post => new { post.Title, post.BlogId }</c>).
/// </para>
/// </param>
/// <returns> A builder to further configure the index. </returns>
public static IndexBuilder <TEntity> ForNpgsqlInclude <TEntity>(
[NotNull] this IndexBuilder <TEntity> indexBuilder,
[NotNull] Expression <Func <TEntity, object> > includeExpression)
{
Check.NotNull(indexBuilder, nameof(indexBuilder));
Check.NotNull(includeExpression, nameof(includeExpression));
indexBuilder.ForNpgsqlInclude(includeExpression.GetPropertyAccessList().Select(x => x.Name).ToArray());
return(indexBuilder);
}
