From 3968f683fd4a6883d896cda698a34729e7338148 Mon Sep 17 00:00:00 2001
From: Arne Juul <arnej@verizonmedia.com>
Date: Tue, 10 Nov 2020 16:15:14 +0000
Subject: optimize join with number, with unit test

---
 .../join_with_number_function_test.cpp             | 136 +++++++++++++++++++++
 1 file changed, 136 insertions(+)
 create mode 100644 eval/src/tests/instruction/join_with_number/join_with_number_function_test.cpp

(limited to 'eval/src/tests/instruction/join_with_number/join_with_number_function_test.cpp')

diff --git a/eval/src/tests/instruction/join_with_number/join_with_number_function_test.cpp b/eval/src/tests/instruction/join_with_number/join_with_number_function_test.cpp
new file mode 100644
index 00000000000..a67fc3725ca
--- /dev/null
+++ b/eval/src/tests/instruction/join_with_number/join_with_number_function_test.cpp
@@ -0,0 +1,136 @@
+// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+
+#include <vespa/vespalib/testkit/test_kit.h>
+#include <vespa/eval/eval/fast_value.h>
+#include <vespa/eval/eval/tensor_function.h>
+#include <vespa/eval/eval/test/eval_fixture.h>
+#include <vespa/eval/eval/test/tensor_model.hpp>
+#include <vespa/eval/instruction/join_with_number_function.h>
+
+#include <vespa/vespalib/util/stringfmt.h>
+
+using namespace vespalib;
+using namespace vespalib::eval;
+using namespace vespalib::eval::test;
+using namespace vespalib::eval::tensor_function;
+
+using vespalib::make_string_short::fmt;
+
+using Primary = JoinWithNumberFunction::Primary;
+
+namespace vespalib::eval {
+
+std::ostream &operator<<(std::ostream &os, Primary primary)
+{
+    switch(primary) {
+    case Primary::LHS: return os << "LHS";
+    case Primary::RHS: return os << "RHS";
+    }
+    abort();
+}
+
+}
+
+const ValueBuilderFactory &prod_factory = FastValueBuilderFactory::get();
+
+EvalFixture::ParamRepo make_params() {
+    return EvalFixture::ParamRepo()
+        .add("a", spec(1.5))
+        .add("number", spec(2.5))        
+        .add("sparse", spec({x({"a"})}, N()))
+        .add("dense", spec({y(5)}, N()))
+        .add("mixed", spec({x({"a"}),y(5)}, N()))
+        .add("mixed_float", spec(float_cells({x({"a"}),y(5)}), N()))
+        .add("mixed_inplace", spec({x({"a"}),y(5)}, N()), true)
+        .add_matrix("x", 3, "y", 5);
+}
+EvalFixture::ParamRepo param_repo = make_params();
+
+void verify_optimized(const vespalib::string &expr, Primary primary, bool inplace) {
+    EvalFixture slow_fixture(prod_factory, expr, param_repo, false);
+    EvalFixture fixture(prod_factory, expr, param_repo, true, true);
+    EXPECT_EQUAL(fixture.result(), EvalFixture::ref(expr, param_repo));
+    EXPECT_EQUAL(fixture.result(), slow_fixture.result());
+    auto info = fixture.find_all<JoinWithNumberFunction>();
+    ASSERT_EQUAL(info.size(), 1u);
+    EXPECT_TRUE(info[0]->result_is_mutable());
+    EXPECT_EQUAL(info[0]->primary(), primary);
+    EXPECT_EQUAL(info[0]->inplace(), inplace);
+    int p_inplace = inplace ? ((primary == Primary::LHS) ? 0 : 1) : -1;
+    EXPECT_TRUE((p_inplace == -1) || (fixture.num_params() > size_t(p_inplace)));
+    for (size_t i = 0; i < fixture.num_params(); ++i) {
+        if (i == size_t(p_inplace)) {
+            EXPECT_EQUAL(fixture.get_param(i), fixture.result());
+        } else {
+            EXPECT_NOT_EQUAL(fixture.get_param(i), fixture.result());
+        }
+    }
+}
+
+void verify_not_optimized(const vespalib::string &expr) {
+    EvalFixture slow_fixture(prod_factory, expr, param_repo, false);
+    EvalFixture fixture(prod_factory, expr, param_repo, true);
+    EXPECT_EQUAL(fixture.result(), EvalFixture::ref(expr, param_repo));
+    EXPECT_EQUAL(fixture.result(), slow_fixture.result());
+    auto info = fixture.find_all<JoinWithNumberFunction>();
+    EXPECT_TRUE(info.empty());
+}
+
+TEST("require that dense number join can be optimized") {
+    TEST_DO(verify_optimized("x3y5+a", Primary::LHS, false));
+    TEST_DO(verify_optimized("a+x3y5", Primary::RHS, false));
+    TEST_DO(verify_optimized("x3y5f*a", Primary::LHS, false));
+    TEST_DO(verify_optimized("a*x3y5f", Primary::RHS, false));
+}
+
+TEST("require that dense number join can be inplace") {
+    TEST_DO(verify_optimized("@x3y5*a", Primary::LHS, true));
+    TEST_DO(verify_optimized("a*@x3y5", Primary::RHS, true));
+    TEST_DO(verify_optimized("@x3y5f+a", Primary::LHS, true));
+    TEST_DO(verify_optimized("a+@x3y5f", Primary::RHS, true));
+}
+
+TEST("require that asymmetric operations work") {
+    TEST_DO(verify_optimized("x3y5/a", Primary::LHS, false));
+    TEST_DO(verify_optimized("a/x3y5", Primary::RHS, false));
+    TEST_DO(verify_optimized("x3y5f-a", Primary::LHS, false));
+    TEST_DO(verify_optimized("a-x3y5f", Primary::RHS, false));
+}
+
+TEST("require that mixed number join can be optimized") {
+    TEST_DO(verify_optimized("mixed+a", Primary::LHS, false));
+    TEST_DO(verify_optimized("a+mixed", Primary::RHS, false));
+    TEST_DO(verify_optimized("mixed<a", Primary::LHS, false));
+    TEST_DO(verify_optimized("a<mixed", Primary::RHS, false));
+    TEST_DO(verify_optimized("mixed_float+a", Primary::LHS, false));
+    TEST_DO(verify_optimized("a+mixed_float", Primary::RHS, false));
+    TEST_DO(verify_optimized("mixed_float<a", Primary::LHS, false));
+    TEST_DO(verify_optimized("a<mixed_float", Primary::RHS, false));
+}
+
+TEST("require that mixed number join can be inplace") {
+    TEST_DO(verify_optimized("mixed_inplace+a", Primary::LHS, true));
+    TEST_DO(verify_optimized("a+mixed_inplace", Primary::RHS, true));
+    TEST_DO(verify_optimized("mixed_inplace<a", Primary::LHS, true));
+    TEST_DO(verify_optimized("a<mixed_inplace", Primary::RHS, true));
+}
+
+TEST("require that all appropriate cases are optimized, others not") {
+    int optimized = 0;
+    for (vespalib::string lhs: {"number", "dense", "sparse", "mixed"}) {
+        for (vespalib::string rhs: {"number", "dense", "sparse", "mixed"}) {
+            auto expr = fmt("%s+%s", lhs.c_str(), rhs.c_str());
+            TEST_STATE(expr.c_str());
+            if ((lhs == "number") != (rhs == "number")) {
+                auto which = (rhs == "number") ? Primary::LHS : Primary::RHS;
+                verify_optimized(expr, which, false);
+                ++optimized;
+            } else {
+                verify_not_optimized(expr);
+            }
+        }
+    }
+    EXPECT_EQUAL(optimized, 6);
+}
+
+TEST_MAIN() { TEST_RUN_ALL(); }
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