YQ Connector: move tests from yql to ydb (OSS)

Перенос папки с тестами на Коннектор из папки yql в папку ydb (синхронизируется с github).

1 files changed, 22 insertions, 0 deletions

diff --git a/contrib/clickhouse/src/Interpreters/RewriteCountDistinctVisitor.h b/contrib/clickhouse/src/Interpreters/RewriteCountDistinctVisitor.h
new file mode 100644
index 0000000000..b15c03f9c2
--- /dev/null
+++ b/contrib/clickhouse/src/Interpreters/RewriteCountDistinctVisitor.h
@@ -0,0 +1,22 @@
+#pragma once
+
+#include <Parsers/IAST.h>
+#include <Interpreters/InDepthNodeVisitor.h>
+#include "Interpreters/TreeRewriter.h"
+
+namespace DB
+{
+
+class ASTFunction;
+
+/// Really simple rewrite 'select countDistinct(a) from t' to 'select count(1) from (select a from t groupBy a)'
+class RewriteCountDistinctFunctionMatcher
+{
+public:
+    struct Data {};
+    static void visit(ASTPtr & ast, Data &);
+    static bool needChildVisit(const ASTPtr &, const ASTPtr &) { return true; }
+};
+
+using RewriteCountDistinctFunctionVisitor = InDepthNodeVisitor<RewriteCountDistinctFunctionMatcher, true>;
+}