polardbxengine/unittest/gunit/make_sortkey-t.cc

/* Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved.

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   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

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   as designated in a particular file or component or in included license
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.

   You should have received a copy of the GNU General Public License
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */

#include <gtest/gtest.h>
#include <sys/types.h>

#include "my_inttypes.h"
#include "sql/filesort.h"
#include "sql/sort_param.h"
#include "sql/sql_lex.h"
#include "sql/sql_sort.h"
#include "sql/sys_vars.h"
#include "unittest/gunit/fake_table.h"
#include "unittest/gunit/test_utils.h"

namespace make_sortkey_unittest {

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

/**
   Test that sortlength() and make_sortkey() agree on what to do:
   i.e. that there is no buffer underwrite/overwrite in make_sortkey()
   if sortlength() has set a very small size.

   We allocate a buffer, fill it with 'a's and then tell make_sortkey()
   to put it's result somewhere in the middle.
   The buffer should be unchanged outside of the area determined by sortlength.
 */
class MakeSortKeyTest : public ::testing::Test {
 protected:
  MakeSortKeyTest() {
    m_sort_fields[0] = st_sort_field();
    m_sort_fields[1] = st_sort_field();
    m_sort_param.local_sortorder =
        Bounds_checked_array<st_sort_field>(m_sort_fields, 1);
    memset(m_buff, 'a', sizeof(m_buff));
    m_to = Bounds_checked_array<uchar>(&m_buff[8], sizeof(m_buff) - 8);
  }

  virtual void SetUp() { initializer.SetUp(); }
  virtual void TearDown() { initializer.TearDown(); }

  THD *thd() { return initializer.thd(); }

  void verify_buff(uint length) {
    for (uchar *pu = m_buff; pu < m_to.array(); ++pu) {
      EXPECT_EQ('a', *pu) << " position " << pu - m_buff;
    }
    for (uchar *pu = m_to.array() + length; pu < m_buff + 100; ++pu) {
      EXPECT_EQ('a', *pu) << " position " << pu - m_buff;
    }
  }

  Server_initializer initializer;

  Sort_param m_sort_param;
  st_sort_field m_sort_fields[2];  // sortlength() adds an end marker !!
  uchar m_ref_buff[4];             // unused, but needed for make_sortkey()
  uchar m_buff[100];
  Bounds_checked_array<uchar> m_to;
};

TEST_F(MakeSortKeyTest, IntResult) {
  thd()->variables.max_sort_length = 4U;
  m_sort_fields[0].item = new Item_int(42);

  const uint total_length = sortlength(thd(), m_sort_fields, 1);
  EXPECT_EQ(sizeof(longlong), total_length);
  EXPECT_EQ(sizeof(longlong), m_sort_fields[0].length);
  EXPECT_EQ(INT_RESULT, m_sort_fields[0].result_type);

  m_sort_param.make_sortkey(m_to, m_ref_buff);
  SCOPED_TRACE("");
  verify_buff(total_length);
}

TEST_F(MakeSortKeyTest, IntResultNull) {
  thd()->variables.max_sort_length = 4U;
  Item *int_item = m_sort_fields[0].item = new Item_int(42);
  int_item->maybe_null = true;
  int_item->null_value = true;

  const uint total_length = sortlength(thd(), m_sort_fields, 1);
  EXPECT_EQ(1 + sizeof(longlong), total_length);
  EXPECT_EQ(sizeof(longlong), m_sort_fields[0].length);
  EXPECT_EQ(INT_RESULT, m_sort_fields[0].result_type);

  m_sort_param.make_sortkey(m_to, m_ref_buff);
  SCOPED_TRACE("");
  verify_buff(total_length);
}

TEST_F(MakeSortKeyTest, DecimalResult) {
  const char dec_str[] = "1234567890.1234567890";
  thd()->variables.max_sort_length = 4U;
  m_sort_fields[0].item =
      new Item_decimal(POS(), dec_str, strlen(dec_str), &my_charset_bin);
  Parse_context pc(thd(), thd()->lex->current_select());
  EXPECT_FALSE(m_sort_fields[0].item->itemize(&pc, &m_sort_fields[0].item));

  const uint total_length = sortlength(thd(), m_sort_fields, 1);
  EXPECT_EQ(10U, total_length);
  EXPECT_EQ(10U, m_sort_fields[0].length);
  EXPECT_EQ(DECIMAL_RESULT, m_sort_fields[0].result_type);

  m_sort_param.make_sortkey(m_to, m_ref_buff);
  SCOPED_TRACE("");
  verify_buff(total_length);
}

TEST_F(MakeSortKeyTest, RealResult) {
  const char dbl_str[] = "1234567890.1234567890";
  thd()->variables.max_sort_length = 4U;
  m_sort_fields[0].item = new Item_float(dbl_str, strlen(dbl_str));

  const uint total_length = sortlength(thd(), m_sort_fields, 1);
  EXPECT_EQ(sizeof(double), total_length);
  EXPECT_EQ(sizeof(double), m_sort_fields[0].length);
  EXPECT_EQ(REAL_RESULT, m_sort_fields[0].result_type);

  m_sort_param.make_sortkey(m_to, m_ref_buff);
  SCOPED_TRACE("");
  verify_buff(total_length);
}

TEST_F(MakeSortKeyTest, AddonFields) {
  m_sort_fields[0].item = new Item_int(42);
  const uint total_length = sortlength(thd(), m_sort_fields, 1);
  EXPECT_EQ(sizeof(longlong), total_length);
  EXPECT_EQ(sizeof(longlong), m_sort_fields[0].length);
  EXPECT_EQ(INT_RESULT, m_sort_fields[0].result_type);

  Sort_addon_field addon_field;
  float val = M_PI;
  Field_float field(nullptr, 0, nullptr, '\0', Field::NONE, "", 0, false,
                    false);
  Fake_TABLE table(&field);
  table.s->db_low_byte_first = false;
  field.ptr = reinterpret_cast<unsigned char *>(&val);
  addon_field.field = &field;
  addon_field.offset = 2;  // Need room for the length bytes.
  addon_field.max_length = field.max_packed_col_length();
  Addon_fields addon_fields(make_array(&addon_field, 1));
  addon_fields.set_using_packed_addons(true);
  m_sort_param.addon_fields = &addon_fields;

  // Test regular packing.
  size_t len = m_sort_param.make_sortkey(m_to, m_ref_buff);
  EXPECT_EQ(total_length + sizeof(float) + addon_field.offset, len);
  float unpacked_val;
  field.unpack(reinterpret_cast<uchar *>(&unpacked_val),
               m_to.array() + m_sort_fields[0].length + addon_field.offset,
               /*param_data=*/0, /*low_byte_first=*/false);
  EXPECT_EQ(unpacked_val, val);

  // Test truncation. (The actual contents don't matter in this case.)
  std::unique_ptr<uchar[]> trunc_buf(new uchar[len - 2]);
  size_t trunc_len = m_sort_param.make_sortkey(
      make_array(trunc_buf.get(), len - 2), m_ref_buff);
  EXPECT_GT(trunc_len, len - 2)
      << "make_sortkey() should report back that there was not enough room.";
}

}  // namespace make_sortkey_unittest