Refine count-query derivation parameter post-processing.

We've now expanded parameter post-processing for derived count queries to consider binding types (in, like) and to correctly retain invocation parameter redirects instead of assuming an exact mapping of parameter positions in the final query to the actual invocation argument names/indices.

Closes #3784

spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/query/ParameterBinding.java

@@ -155,6 +155,10 @@ public Object prepare(@Nullable Object valueToBind) {
 	 */
 	public boolean bindsTo(ParameterBinding other) {
 
+		if (getIdentifier().equals(other.getIdentifier())) {
+			return true;
+		}
+
 		if (identifier.hasName() && other.identifier.hasName()) {
 			if (identifier.getName().equals(other.identifier.getName())) {
 				return true;
@@ -502,6 +506,16 @@ static Expression ofExpression(String expression) {
 			return new Expression(expression);
 		}
 
+		/**
+		 * Creates a {@link MethodInvocationArgument} object for {@code name}
+		 *
+		 * @param name the parameter name from the method invocation.
+		 * @return {@link MethodInvocationArgument} object for {@code name}.
+		 */
+		static MethodInvocationArgument ofParameter(String name) {
+			return ofParameter(name, null);
+		}
+
 		/**
 		 * Creates a {@link MethodInvocationArgument} object for {@code name} and {@code position}. Either the name or the
 		 * position must be given.

spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/query/StringQuery.java

@@ -23,6 +23,7 @@
 import java.util.function.BiFunction;
 import java.util.function.Consumer;
 import java.util.function.Function;
+import java.util.function.Predicate;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -121,8 +122,11 @@ public DeclaredQuery deriveCountQuery(@Nullable String countQueryProjection) {
 
 			for (ParameterBinding binding : bindings) {
 
-				if (binding.getOrigin().isExpression() && derivedBindings
-						.removeIf(it -> !it.getOrigin().isExpression() && it.getIdentifier().equals(binding.getIdentifier()))) {
+				Predicate<ParameterBinding> identifier = binding::bindsTo;
+				Predicate<ParameterBinding> notCompatible = Predicate.not(binding::isCompatibleWith);
+
+				// replace incompatible bindings
+				if (derivedBindings.removeIf(it -> identifier.test(it) && notCompatible.test(it))) {
 					derivedBindings.add(binding);
 				}
 			}

spring-data-jpa/src/test/java/org/springframework/data/jpa/repository/query/StringQueryUnitTests.java

@@ -160,6 +160,66 @@ void rewritesNamedLikeToUniqueParametersIfNecessary() {
 		assertThat(((MethodInvocationArgument) parameterBinding.getOrigin()).identifier().getName()).isEqualTo("firstname");
 	}
 
+	@Test // GH-3784
+	void rewritesNamedLikeToUniqueParametersRetainingCountQuery() {
+
+		DeclaredQuery query = new StringQuery(
+				"select u from User u where u.firstname like %:firstname or u.firstname like :firstname% or u.firstname = :firstname",
+				false).deriveCountQuery(null);
+
+		assertThat(query.getQueryString()) //
+				.isEqualTo(
+						"select count(u) from User u where u.firstname like :firstname or u.firstname like :firstname_1 or u.firstname = :firstname_2");
+
+		List<ParameterBinding> bindings = query.getParameterBindings();
+		assertThat(bindings).hasSize(3);
+
+		LikeParameterBinding binding = (LikeParameterBinding) bindings.get(0);
+		assertThat(binding).isNotNull();
+		assertThat(binding.getOrigin()).isEqualTo(ParameterOrigin.ofParameter("firstname"));
+		assertThat(binding.getName()).isEqualTo("firstname");
+		assertThat(binding.getType()).isEqualTo(Type.ENDING_WITH);
+
+		binding = (LikeParameterBinding) bindings.get(1);
+		assertThat(binding).isNotNull();
+		assertThat(binding.getOrigin()).isEqualTo(ParameterOrigin.ofParameter("firstname"));
+		assertThat(binding.getName()).isEqualTo("firstname_1");
+		assertThat(binding.getType()).isEqualTo(Type.STARTING_WITH);
+
+		ParameterBinding parameterBinding = bindings.get(2);
+		assertThat(parameterBinding).isNotNull();
+		assertThat(parameterBinding.getOrigin()).isEqualTo(ParameterOrigin.ofParameter("firstname"));
+		assertThat(parameterBinding.getName()).isEqualTo("firstname_2");
+		assertThat(((MethodInvocationArgument) parameterBinding.getOrigin()).identifier().getName()).isEqualTo("firstname");
+	}
+
+	@Test // GH-3784
+	void rewritesExpressionsLikeToUniqueParametersRetainingCountQuery() {
+
+		DeclaredQuery query = new StringQuery(
+				"select u from User u where u.firstname like %:#{firstname} or u.firstname like :#{firstname}%", false)
+				.deriveCountQuery(null);
+
+		assertThat(query.getQueryString()) //
+				.isEqualTo(
+						"select count(u) from User u where u.firstname like :__$synthetic$__1 or u.firstname like :__$synthetic$__2");
+
+		List<ParameterBinding> bindings = query.getParameterBindings();
+		assertThat(bindings).hasSize(2);
+
+		LikeParameterBinding binding = (LikeParameterBinding) bindings.get(0);
+		assertThat(binding).isNotNull();
+		assertThat(binding.getOrigin()).isEqualTo(ParameterOrigin.ofExpression("firstname"));
+		assertThat(binding.getName()).isEqualTo("__$synthetic$__1");
+		assertThat(binding.getType()).isEqualTo(Type.ENDING_WITH);
+
+		binding = (LikeParameterBinding) bindings.get(1);
+		assertThat(binding).isNotNull();
+		assertThat(binding.getOrigin()).isEqualTo(ParameterOrigin.ofExpression("firstname"));
+		assertThat(binding.getName()).isEqualTo("__$synthetic$__2");
+		assertThat(binding.getType()).isEqualTo(Type.STARTING_WITH);
+	}
+
 	@Test // GH-3041
 	void rewritesPositionalLikeToUniqueParametersIfNecessary() {
 
@@ -263,6 +323,48 @@ void detectsMultipleNamedInParameterBindings() {
 		assertNamedBinding(ParameterBinding.class, "bar", bindings.get(2));
 	}
 
+	@Test // GH-3784
+	void deriveCountQueryWithNamedInRetainsOrigin() {
+
+		String queryString = "select u from User u where (:logins) IS NULL OR LOWER(u.login) IN (:logins)";
+		DeclaredQuery query = new StringQuery(queryString, false).deriveCountQuery(null);
+
+		assertThat(query.getQueryString())
+				.isEqualTo("select count(u) from User u where (:logins) IS NULL OR LOWER(u.login) IN (:logins_1)");
+
+		List<ParameterBinding> bindings = query.getParameterBindings();
+		assertThat(bindings).hasSize(2);
+
+		assertNamedBinding(ParameterBinding.class, "logins", bindings.get(0));
+		assertThat((MethodInvocationArgument) bindings.get(0).getOrigin()).extracting(MethodInvocationArgument::identifier)
+				.extracting(BindingIdentifier::getName).isEqualTo("logins");
+
+		assertNamedBinding(InParameterBinding.class, "logins_1", bindings.get(1));
+		assertThat((MethodInvocationArgument) bindings.get(1).getOrigin()).extracting(MethodInvocationArgument::identifier)
+				.extracting(BindingIdentifier::getName).isEqualTo("logins");
+	}
+
+	@Test // GH-3784
+	void deriveCountQueryWithPositionalInRetainsOrigin() {
+
+		String queryString = "select u from User u where (?1) IS NULL OR LOWER(u.login) IN (?1)";
+		DeclaredQuery query = new StringQuery(queryString, false).deriveCountQuery(null);
+
+		assertThat(query.getQueryString())
+				.isEqualTo("select count(u) from User u where (?1) IS NULL OR LOWER(u.login) IN (?2)");
+
+		List<ParameterBinding> bindings = query.getParameterBindings();
+		assertThat(bindings).hasSize(2);
+
+		assertPositionalBinding(ParameterBinding.class, 1, bindings.get(0));
+		assertThat((MethodInvocationArgument) bindings.get(0).getOrigin()).extracting(MethodInvocationArgument::identifier)
+				.extracting(BindingIdentifier::getPosition).isEqualTo(1);
+
+		assertPositionalBinding(InParameterBinding.class, 2, bindings.get(1));
+		assertThat((MethodInvocationArgument) bindings.get(1).getOrigin()).extracting(MethodInvocationArgument::identifier)
+				.extracting(BindingIdentifier::getPosition).isEqualTo(1);
+	}
+
 	@Test // DATAJPA-461
 	void detectsPositionalInParameterBindings() {