Optimize LIKE when user specified escape char

Currently we have optimization for LIKE only when user does not
specify escape char, this commit provides optimization(kPrefix,
kSuffix, kFixed, kSubstring) when user specified escape char.

velox/benchmarks/basic/CMakeLists.txt

@@ -63,10 +63,15 @@ add_executable(velox_benchmark_basic_preproc Preproc.cpp)
 target_link_libraries(velox_benchmark_basic_preproc ${velox_benchmark_deps}
                       velox_functions_prestosql velox_vector_test_lib)
 
-add_executable(velox_like_functions_benchmark LikeFunctionsBenchmark.cpp)
-target_link_libraries(velox_like_functions_benchmark ${velox_benchmark_deps}
+add_executable(velox_like_tpch_benchmark LikeTpchBenchmark.cpp)
+target_link_libraries(velox_like_tpch_benchmark ${velox_benchmark_deps}
                       velox_functions_lib velox_tpch_gen velox_vector_test_lib)
 
+add_executable(velox_like_benchmark LikeBenchmark.cpp)
+target_link_libraries(
+  velox_like_benchmark ${velox_benchmark_deps} velox_functions_lib
+  velox_functions_prestosql velox_vector_test_lib)
+
 add_executable(velox_benchmark_basic_vector_fuzzer VectorFuzzer.cpp)
 target_link_libraries(velox_benchmark_basic_vector_fuzzer
                       ${velox_benchmark_deps} velox_vector_test_lib)

velox/benchmarks/basic/LikeBenchmark.cpp

@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <folly/Benchmark.h>
+#include <folly/init/Init.h>
+
+#include "velox/benchmarks/ExpressionBenchmarkBuilder.h"
+#include "velox/functions/lib/Re2Functions.h"
+#include "velox/functions/prestosql/registration/RegistrationFunctions.h"
+
+using namespace facebook;
+using namespace facebook::velox;
+using namespace facebook::velox::functions;
+using namespace facebook::velox::functions::test;
+using namespace facebook::velox::memory;
+using namespace facebook::velox;
+
+int main(int argc, char** argv) {
+  folly::Init init(&argc, &argv);
+
+  exec::registerStatefulVectorFunction("like", likeSignatures(), makeLike);
+  // Register the scalar functions.
+  prestosql::registerAllScalarFunctions("");
+
+  // exec::register
+  ExpressionBenchmarkBuilder benchmarkBuilder;
+  const vector_size_t vectorSize = 1000;
+  auto vectorMaker = benchmarkBuilder.vectorMaker();
+
+  auto makeInput =
+      [&](vector_size_t vectorSize, bool padAtHead, bool padAtTail) {
+        return vectorMaker.flatVector<std::string>(vectorSize, [&](auto row) {
+          // Strings in even rows contain/start with/end with a_b_c depends on
+          // value of padAtHead && padAtTail.
+          if (row % 2 == 0) {
+            auto padding = std::string("x", row / 2 + 1);
+            if (padAtHead && padAtTail) {
+              return fmt::format("{}a_b_c{}", padding, padding);
+            } else if (padAtHead) {
+              return fmt::format("{}a_b_c", padding);
+            } else if (padAtTail) {
+              return fmt::format("a_b_c{}", padding);
+            } else {
+              return std::string("a_b_c");
+            }
+          } else {
+            return std::string("x", row);
+          }
+        });
+      };
+
+  auto substringInput = makeInput(vectorSize, true, true);
+  auto prefixInput = makeInput(vectorSize, false, true);
+  auto suffixInput = makeInput(vectorSize, true, false);
+
+  benchmarkBuilder
+      .addBenchmarkSet(
+          "like_substring", vectorMaker.rowVector({"col0"}, {substringInput}))
+      .addExpression("like_substring", R"(like(col0, '%a\_b\_c%', '\'))")
+      .addExpression("strpos", R"(strpos(col0, 'a_b_c') > 0)");
+
+  benchmarkBuilder
+      .addBenchmarkSet(
+          "like_prefix", vectorMaker.rowVector({"col0"}, {prefixInput}))
+      .addExpression("like_prefix", R"(like(col0, 'a\_b\_c%', '\'))")
+      .addExpression("starts_with", R"(starts_with(col0, 'a_b_c'))");
+
+  benchmarkBuilder
+      .addBenchmarkSet(
+          "like_suffix", vectorMaker.rowVector({"col0"}, {suffixInput}))
+      .addExpression("like_suffix", R"(like(col0, '%a\_b\_c', '\'))")
+      .addExpression("ends_with", R"(ends_with(col0, 'a_b_c'))");
+
+  benchmarkBuilder
+      .addBenchmarkSet(
+          "like_generic", vectorMaker.rowVector({"col0"}, {substringInput}))
+      .addExpression("like_generic", R"(like(col0, '%a%b%c'))");
+
+  benchmarkBuilder.registerBenchmarks();
+  benchmarkBuilder.testBenchmarks();
+  folly::runBenchmarks();
+  return 0;
+}