// modifies usedViews - removes all redundant views from it
internal static bool TrySimplifyJoinRewriting(
ref T_Tile rewriting, T_Tile toAvoid, Dictionary <T_Tile, TileOpKind> usedViews, RewritingProcessor <T_Tile> qp)
{
var simplifier = new RewritingSimplifier <T_Tile>(rewriting, toAvoid, usedViews, qp);
T_Tile simplifiedRewriting;
if (simplifier.SimplifyRewriting(out simplifiedRewriting))
{
rewriting = simplifiedRewriting;
return(true);
}
return(false);
}
// called for top query only
internal static bool TrySimplifyUnionRewriting(ref T_Tile rewriting, T_Tile toFill, T_Tile toAvoid, RewritingProcessor <T_Tile> qp)
{
var simplifier = new RewritingSimplifier <T_Tile>(rewriting, toFill, toAvoid, qp);
// gather all unioned subqueries
T_Tile simplifiedRewriting;
if (simplifier.SimplifyRewriting(out simplifiedRewriting))
{
rewriting = simplifiedRewriting;
return(true);
}
return(false);
}