datastore/tests/performance/like_perfect_affix_rewrite.xml

<test>
  <settings>
      <allow_experimental_analyzer>1</allow_experimental_analyzer>
      <max_threads>1</max_threads>
  </settings>

  <substitutions>
      <substitution>
          <name>table_size</name>
          <values>
              <value>10000000</value>
          </values>
      </substitution>
      <substitution>
          <name>prefix_pattern</name>
          <values>
              <value>'prefix%'</value>
          </values>
      </substitution>
      <substitution>
          <name>suffix_pattern</name>
          <values>
              <value>'%suffix'</value>
          </values>
      </substitution>
  </substitutions>

  <create_query>
      CREATE TABLE tab (
          id UInt64,
          str String,
      ) ENGINE = MergeTree()
      ORDER BY id
  </create_query>

  <fill_query>
      INSERT INTO tab
      SELECT
          number,
          concat('prefix', toString(number), 'suffix')
      FROM numbers({table_size})
  </fill_query>

  <!-- Test prefix matching rewrite -->
  <query>
      SELECT count() FROM tab
      WHERE str LIKE {prefix_pattern}
      SETTINGS optimize_rewrite_like_perfect_affix=0
  </query>

  <query>
      SELECT count() FROM tab
      WHERE str LIKE {prefix_pattern}
      SETTINGS optimize_rewrite_like_perfect_affix=1
  </query>

  <!-- Test suffix matching rewrite -->
  <query>
      SELECT count() FROM tab
      WHERE str LIKE {suffix_pattern}
      SETTINGS optimize_rewrite_like_perfect_affix=0
  </query>

  <query>
      SELECT count() FROM tab
      WHERE str LIKE {suffix_pattern}
      SETTINGS optimize_rewrite_like_perfect_affix=1
  </query>

  <drop_query>DROP TABLE IF EXISTS tab</drop_query>
</test>