Add column rows to system.parts table. [#CLICKHOUSE-2950]

dbms/src/Storages/System/StorageSystemParts.cpp

@@ -24,6 +24,7 @@ StorageSystemParts::StorageSystemParts(const std::string & name_)
         {"replicated",          std::make_shared<DataTypeUInt8>()},
         {"active",              std::make_shared<DataTypeUInt8>()},
         {"marks",               std::make_shared<DataTypeUInt64>()},
+        {"rows",                std::make_shared<DataTypeUInt64>()},
         {"bytes",               std::make_shared<DataTypeUInt64>()},
         {"modification_time",   std::make_shared<DataTypeDateTime>()},
         {"remove_time",         std::make_shared<DataTypeDateTime>()},
@@ -231,6 +232,7 @@ BlockInputStreams StorageSystemParts::read(
                 block.getByPosition(i++).column->insert(replicated);
                 block.getByPosition(i++).column->insert(static_cast<UInt64>(!need[replicated][0] || active_parts.count(part)));
                 block.getByPosition(i++).column->insert(part->size);
+                block.getByPosition(i++).column->insert(part->getExactSizeRows());
                 block.getByPosition(i++).column->insert(static_cast<size_t>(part->size_in_bytes));
                 block.getByPosition(i++).column->insert(part->modification_time);
                 block.getByPosition(i++).column->insert(part->remove_time);

dbms/tests/queries/0_stateless/00296_multiple_attaches_zookeeper.reference

@@ -43,3 +43,4 @@
 4
 4
 4
+4

dbms/tests/queries/0_stateless/00296_multiple_attaches_zookeeper.sql

@@ -63,6 +63,8 @@ SELECT count() FROM system.parts WHERE database = 'test' AND table = 'r1' AND ac
 SELECT count() FROM system.parts WHERE database = 'test' AND table = 'r2' AND active; -- 4
 SELECT count() FROM system.parts WHERE database = 'test' AND table = 'r3' AND active; -- 4
 
+SELECT sum(rows) FROM system.parts WHERE database = 'test' AND table = 'r1' AND active; -- 4
+
 DROP TABLE test.r1;
 DROP TABLE test.r2;
 DROP TABLE test.r3;