polardbxengine/unittest/gunit/locking_clause_syntax-t.cc

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// First include (the generated) my_config.h, to get correct platform defines.
#include "my_config.h"

#include <gtest/gtest.h>
#include <stddef.h>
#include <string>

#include "sql/intrusive_list_iterator.h"
#include "sql/item_func.h"
#include "sql/sql_lex.h"
#include "template_utils.h"
#include "thr_lock.h"
#include "unittest/gunit/parsertest.h"
#include "unittest/gunit/test_utils.h"

namespace locking_clause_syntax_unittest {

using my_testing::Mock_error_handler;
using my_testing::Server_initializer;

class LockingClauseSyntaxTest : public ParserTest {};

/// Class that lets us use the indexing operator on intrusive lists.
template <typename T>
class Intrusive_list_indexer {
 public:
  Intrusive_list_indexer(SQL_I_List<T> list) : m_list(list) {}
  T *operator[](int i) {
    int curr = 0;
    for (T *t = m_list.first; t != NULL; t = t->next_local, ++curr)
      if (curr == i) return t;
    EXPECT_TRUE(false);
    return NULL;
  }

 private:
  SQL_I_List<T> m_list;
};

typedef Intrusive_list_indexer<TABLE_LIST> Table_list_indexer;

using Local_tables_iterator =
    IntrusiveListIterator<TABLE_LIST, &TABLE_LIST::next_local>;

/// A list interface over the TABLE_LIST::next_local pointer.
using Local_tables_list = IteratorContainer<Local_tables_iterator>;

TEST_F(LockingClauseSyntaxTest, LegacyForUpdate) {
  SELECT_LEX *term = parse("SELECT * FROM t0, t1, t2 FOR UPDATE");

  for (auto table : Local_tables_list(term->table_list.first)) {
    EXPECT_EQ(TL_WRITE, table->lock_descriptor().type);
    EXPECT_EQ(THR_WAIT, table->lock_descriptor().action);
  }
}

TEST_F(LockingClauseSyntaxTest, LegacyShared) {
  SELECT_LEX *term = parse("SELECT * FROM t0, t1, t2 LOCK IN SHARE MODE");

  for (auto table : Local_tables_list(term->table_list.first)) {
    EXPECT_EQ(TL_READ_WITH_SHARED_LOCKS, table->lock_descriptor().type);
    EXPECT_EQ(THR_WAIT, table->lock_descriptor().action);
  }
}

TEST_F(LockingClauseSyntaxTest, NameResolution) {
  SELECT_LEX *term = parse(
      "SELECT * "
      "FROM t0 t0_alias, "
      "test.t1, "
      "t2 t2_alias, "
      "t3, "
      "test.t4 t4_alias, "
      "t5, t6, "
      "t7, t8, "
      "t9, t10, "
      "t11 "
      "FOR UPDATE OF t0_alias "
      "FOR UPDATE OF test.t1 SKIP LOCKED "
      "FOR UPDATE OF t2_alias "
      "FOR UPDATE OF t3 NOWAIT "
      "FOR SHARE OF t4_alias "
      "FOR SHARE OF t5, t6 SKIP LOCKED "
      "FOR SHARE OF t7, t8 "
      "FOR SHARE OF t9, t10 NOWAIT ");

  Table_list_indexer tables(term->table_list);

  EXPECT_EQ(TL_WRITE, tables[0]->lock_descriptor().type);
  EXPECT_EQ(THR_WAIT, tables[0]->lock_descriptor().action);

  EXPECT_EQ(TL_WRITE, tables[1]->lock_descriptor().type);
  EXPECT_EQ(THR_SKIP, tables[1]->lock_descriptor().action);

  EXPECT_EQ(TL_WRITE, tables[2]->lock_descriptor().type);
  EXPECT_EQ(THR_WAIT, tables[2]->lock_descriptor().action);

  EXPECT_EQ(TL_WRITE, tables[3]->lock_descriptor().type);
  EXPECT_EQ(THR_NOWAIT, tables[3]->lock_descriptor().action);

  EXPECT_EQ(TL_READ_WITH_SHARED_LOCKS, tables[4]->lock_descriptor().type);
  EXPECT_EQ(THR_WAIT, tables[4]->lock_descriptor().action);

  EXPECT_EQ(TL_READ_WITH_SHARED_LOCKS, tables[5]->lock_descriptor().type);
  EXPECT_EQ(THR_SKIP, tables[5]->lock_descriptor().action);

  EXPECT_EQ(TL_READ_WITH_SHARED_LOCKS, tables[6]->lock_descriptor().type);
  EXPECT_EQ(THR_SKIP, tables[6]->lock_descriptor().action);

  EXPECT_EQ(TL_READ_WITH_SHARED_LOCKS, tables[7]->lock_descriptor().type);
  EXPECT_EQ(THR_WAIT, tables[7]->lock_descriptor().action);

  EXPECT_EQ(TL_READ_WITH_SHARED_LOCKS, tables[8]->lock_descriptor().type);
  EXPECT_EQ(THR_WAIT, tables[8]->lock_descriptor().action);

  EXPECT_EQ(TL_READ_WITH_SHARED_LOCKS, tables[9]->lock_descriptor().type);
  EXPECT_EQ(THR_NOWAIT, tables[9]->lock_descriptor().action);

  EXPECT_EQ(TL_READ_WITH_SHARED_LOCKS, tables[10]->lock_descriptor().type);
  EXPECT_EQ(THR_NOWAIT, tables[10]->lock_descriptor().action);
}

// safe_to_cache_query should be false if there's a locking clause.
TEST_F(LockingClauseSyntaxTest, SafeToCacheQuery) {
  parse("SELECT * FROM t1");
  EXPECT_TRUE(thd()->lex->safe_to_cache_query);

  parse("SELECT * FROM t1 FOR UPDATE");
  EXPECT_FALSE(thd()->lex->safe_to_cache_query);

  parse("SELECT * FROM t1 FOR UPDATE OF t1");
  EXPECT_FALSE(thd()->lex->safe_to_cache_query);

  parse("SELECT * FROM t1, t2 FOR UPDATE OF t1");
  EXPECT_FALSE(thd()->lex->safe_to_cache_query);

  parse("SELECT * FROM t1 LOCK IN SHARE MODE");
  EXPECT_FALSE(thd()->lex->safe_to_cache_query);

  parse("SELECT * FROM t1 FOR SHARE OF t1");
  EXPECT_FALSE(thd()->lex->safe_to_cache_query);

  parse("SELECT * FROM t1, t2 FOR SHARE OF t1");
  EXPECT_FALSE(thd()->lex->safe_to_cache_query);

  init_sql_command_flags();

  // The locking clause should not get contextualized for EXPLAIN.
  parse("EXPLAIN SELECT * FROM t1 FOR UPDATE");
  EXPECT_TRUE(thd()->lex->safe_to_cache_query);

  parse("EXPLAIN SELECT * FROM t1 FOR UPDATE OF t1");
  EXPECT_TRUE(thd()->lex->safe_to_cache_query);

  parse("EXPLAIN SELECT * FROM t1, t2 FOR UPDATE OF t1");
  EXPECT_TRUE(thd()->lex->safe_to_cache_query);

  parse("EXPLAIN SELECT * FROM t1 LOCK IN SHARE MODE");
  EXPECT_TRUE(thd()->lex->safe_to_cache_query);

  parse("EXPLAIN SELECT * FROM t1 FOR SHARE OF t1");
  EXPECT_TRUE(thd()->lex->safe_to_cache_query);

  parse("EXPLAIN SELECT * FROM t1, t2 FOR SHARE OF t1");
  EXPECT_TRUE(thd()->lex->safe_to_cache_query);
}

TEST_F(LockingClauseSyntaxTest, BinlogSafety) {
  const auto unsafe_skip_locked =
      Query_tables_list::BINLOG_STMT_UNSAFE_SKIP_LOCKED;
  const auto unsafe_nowait = Query_tables_list::BINLOG_STMT_UNSAFE_NOWAIT;

  parse("INSERT INTO t1 SELECT * FROM t1 FOR UPDATE");
  EXPECT_FALSE(thd()->lex->is_stmt_unsafe(unsafe_skip_locked));
  EXPECT_FALSE(thd()->lex->is_stmt_unsafe(unsafe_nowait));

  parse("INSERT INTO t1 SELECT * FROM t1 FOR UPDATE SKIP LOCKED");
  EXPECT_TRUE(thd()->lex->is_stmt_unsafe(unsafe_skip_locked));
  EXPECT_FALSE(thd()->lex->is_stmt_unsafe(unsafe_nowait));

  parse("INSERT INTO t1 SELECT * FROM t1 FOR UPDATE NOWAIT");
  EXPECT_FALSE(thd()->lex->is_stmt_unsafe(unsafe_skip_locked));
  EXPECT_TRUE(thd()->lex->is_stmt_unsafe(unsafe_nowait));

  parse(
      "INSERT INTO t1 SELECT * FROM t1, t2 "
      "FOR UPDATE OF t1 SKIP LOCKED FOR UPDATE OF t2 NOWAIT");
  EXPECT_TRUE(thd()->lex->is_stmt_unsafe(unsafe_skip_locked));
  EXPECT_TRUE(thd()->lex->is_stmt_unsafe(unsafe_nowait));

  parse(
      "UPDATE t3 SET a = "
      "(SELECT b FROM t1 WHERE a >= 2 LIMIT 1 FOR UPDATE SKIP LOCKED)");
  EXPECT_TRUE(thd()->lex->is_stmt_unsafe(unsafe_skip_locked));
  EXPECT_FALSE(thd()->lex->is_stmt_unsafe(unsafe_nowait));

  parse(
      "UPDATE t3 SET a = "
      "(SELECT b FROM t1 WHERE a >= 2 LIMIT 1 FOR UPDATE NOWAIT)");
  EXPECT_FALSE(thd()->lex->is_stmt_unsafe(unsafe_skip_locked));
  EXPECT_TRUE(thd()->lex->is_stmt_unsafe(unsafe_nowait));
}

}  // namespace locking_clause_syntax_unittest