public override System.Linq.Expressions.Expression Translate(Expression expression)
{
expression = OrderByRewriter.Rewrite(expression);
expression = UnusedColumnRemover.Remove(expression);
expression = RedundantColumnRemover.Remove(expression);
expression = RedundantSubqueryRemover.Remove(expression);
var rewritten = CrossApplyRewriter.Rewrite(expression);
rewritten = CrossJoinRewriter.Rewrite(rewritten);
if (rewritten != expression)
{
expression = rewritten;
expression = UnusedColumnRemover.Remove(expression);
expression = RedundantSubqueryRemover.Remove(expression);
expression = RedundantJoinRemover.Remove(expression);
expression = RedundantColumnRemover.Remove(expression);
}
expression = SkipToRowNumberRewriter.Rewrite(expression);
expression = OrderByRewriter.Rewrite(expression);
return(expression);
}
public override Expression Translate(Expression expression)
{
expression = OrderByRewriter.Rewrite(expression);
expression = base.Translate(expression);
expression = SkipToRowNumberRewriter.Rewrite(expression);
expression = OrderByRewriter.Rewrite(expression);
return(expression);
}
public static Expression Rewrite(Expression expression, out bool hasRowNumberExpression)
{
var rewriter = new SkipToRowNumberRewriter(VfpLanguage.Default);
expression = rewriter.Visit(expression);
hasRowNumberExpression = rewriter._hasRowNumberExpression;
return expression;
}
public override Expression Translate(Expression expression)
{
bool hasRowNumberExpression;
// fix up any order-by's
expression = OrderByRewriter.Rewrite(this.Language, expression);
expression = XmlToCursorExpressionRewriter.Rewrite(expression);
// remove redundant layers again before cross apply rewrite
expression = UnusedColumnRemover.Remove(expression);
expression = RedundantColumnRemover.Remove(expression);
expression = RedundantSubqueryRemover.Remove(expression);
expression = OneBasedIndexRewriter.Rewrite(expression);
// convert cross-apply and outer-apply joins into inner & left-outer-joins if possible
var rewritten = CrossApplyRewriter.Rewrite(this.language, expression);
// convert cross joins into inner joins
rewritten = CrossJoinRewriter.Rewrite(rewritten);
if (rewritten != expression)
{
expression = rewritten;
// do final reduction
expression = UnusedColumnRemover.Remove(expression);
expression = RedundantSubqueryRemover.Remove(expression);
expression = RedundantJoinRemover.Remove(expression);
expression = RedundantColumnRemover.Remove(expression);
}
// convert skip/take info into RowNumber pattern
expression = SkipToRowNumberRewriter.Rewrite(expression, out hasRowNumberExpression);
expression = SkipToNestedOrderByRewriter.Rewrite(this.Language, expression);
expression = UnusedColumnRemover.Remove(expression);
expression = WhereCountComparisonRewriter.Rewrite(expression);
if (!hasRowNumberExpression)
{
expression = OrderByRewriter.Rewrite(this.Language, expression);
expression = RedundantSubqueryRemover.Remove(expression);
}
expression = VfpCrossJoinIsolator.Isolate(expression);
expression = ConditionalImmediateIfNullRemover.Remove(expression);
expression = XmlToCursorJoinRewriter.Rewrite(expression);
return(expression);
}
public override Expression Translate(Expression expression)
{
// fix up any order-by's
expression = OrderByRewriter.Rewrite(this.Language, expression);
expression = base.Translate(expression);
// convert skip/take info into RowNumber pattern
expression = SkipToRowNumberRewriter.Rewrite(this.Language, expression);
// fix up any order-by's we may have changed
expression = OrderByRewriter.Rewrite(this.Language, expression);
return(expression);
}
