Bug#31347488 CLANG COMPILER WARNINGS [noclose]

Building the ndbcluster plugin source code with clang 10 yields some compiler warnings. The warnings pinpoint certain code constructs which could be improved. Fix compiler warnings like: - warning: unused variable 'sj_nest' [-Wunused-variable] const ndb_table_access_map sj_nest(m_tables[tab_no].m_sj_nest); ^ Change-Id: Icf425452d335d56f48bdc9fea2b9f6a35b5ac009

Author: blaudden

storage/ndb/plugin/ha_ndbcluster_push.cc

@@ -1292,7 +1292,6 @@ bool ndb_pushed_builder_ctx::is_pushable_as_child_scan(
  // (We support semi-join only if firstMatch strategy is used)
  DBUG_ASSERT(m_tables[tab_no].m_sj_nest.contain(table->get_access_no()));
 
- const ndb_table_access_map sj_nest(m_tables[tab_no].m_sj_nest);
  if (!is_pushable_within_nest(table, m_tables[tab_no].m_sj_nest, "semi")) {
  return false;
  }