YQ-2651 use ChildPtr instead of ChildRef

Author: zverevgeny

ydb/library/yql/core/yql_match_recognize.h

@@ -14,12 +14,12 @@ inline TRowPattern ConvertPattern(const TExprNode::TPtr& pattern, TExprContext &
             result.back().push_back(TRowPatternFactor{
                 factor->ChildRef(0)->IsAtom() ?
                     TRowPatternPrimary(TString(factor->ChildRef(0)->Content())) :
-                    ConvertPattern(factor->ChildRef(0), ctx, ++nestingLevel),
-                FromString<ui64>(factor->ChildRef(1)->Content()),
-                FromString<ui64>(factor->ChildRef(2)->Content()),
-                FromString<bool>(factor->ChildRef(3)->Content()),
-                FromString<bool>(factor->ChildRef(4)->Content()),
-                FromString<bool>(factor->ChildRef(5)->Content())
+                    ConvertPattern(factor->Child(0), ctx, ++nestingLevel),
+                FromString<ui64>(factor->ChildPtr(1)->Content()),
+                FromString<ui64>(factor->ChildPtr(2)->Content()),
+                FromString<bool>(factor->ChildPtr(3)->Content()),
+                FromString<bool>(factor->ChildPtr(4)->Content()),
+                FromString<bool>(factor->ChildPtr(5)->Content())
             });
         }
     }