Fix issue with query alias case sensitive and JPAQL strict compliance

hibernate-core/src/main/java/org/hibernate/query/hql/internal/SqmPathRegistryImpl.java

@@ -233,9 +233,13 @@ private boolean definesAttribute(SqmPathSource containerType, String name) {
 	public SqmAliasedNode<?> findAliasedNodeByAlias(String alias) {
 		assert alias != null;
 
+		final String aliasToUse = jpaCompliance.isJpaQueryComplianceEnabled()
+				? alias.toLowerCase( Locale.getDefault() )
+				: alias;
+
 		for ( int i = 0; i < simpleSelectionNodes.size(); i++ ) {
 			final SqmAliasedNode<?> node = simpleSelectionNodes.get( i );
-			if ( alias.equals( node.getAlias() ) ) {
+			if ( aliasToUse.equals( node.getAlias() ) ) {
 				return node;
 			}
 		}
@@ -249,11 +253,15 @@ public Integer findAliasedNodePosition(String alias) {
 			return null;
 		}
 
+		final String aliasToUse = jpaCompliance.isJpaQueryComplianceEnabled()
+				? alias.toLowerCase( Locale.getDefault() )
+				: alias;
+
 		// NOTE : 1-based
 
 		for ( int i = 0; i < simpleSelectionNodes.size(); i++ ) {
 			final SqmAliasedNode<?> node = simpleSelectionNodes.get( i );
-			if ( alias.equals( node.getAlias() ) ) {
+			if ( aliasToUse.equals( node.getAlias() ) ) {
 				return i + 1;
 			}
 		}

hibernate-core/src/test/java/org/hibernate/orm/test/jpa/JpaqlStrictComplianceAliasTest.java

@@ -0,0 +1,87 @@
+package org.hibernate.orm.test.jpa;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+
+import org.hibernate.cfg.Environment;
+
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.ServiceRegistry;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.hibernate.testing.orm.junit.Setting;
+import org.junit.jupiter.api.Test;
+
+@DomainModel(
+		annotatedClasses = JpaqlStrictComplianceAliasTest.Part.class
+)
+@ServiceRegistry(
+		settings = @Setting(name = Environment.JPAQL_STRICT_COMPLIANCE, value = "true")
+)
+@SessionFactory
+public class JpaqlStrictComplianceAliasTest {
+
+	@Test
+	public void testAlias(SessionFactoryScope scope) {
+		scope.inTransaction(
+				session ->
+						session.createQuery( "select p.stockNumber as stockNo FROM Part p ORDER BY stockNo" )
+								.getResultList()
+		);
+	}
+
+	@Test
+	public void testAlias2(SessionFactoryScope scope) {
+		scope.inTransaction(
+				session ->
+						session.createQuery( "select p.stockNumber as stockNo FROM Part P ORDER BY stockNo" )
+								.getResultList()
+		);
+	}
+
+	@Test
+	public void testAlias3(SessionFactoryScope scope) {
+		scope.inTransaction(
+				session ->
+						session.createQuery( "select P.stockNumber as stockNo FROM Part P ORDER BY stockNo" )
+								.getResultList()
+		);
+	}
+
+
+	@Entity(name = "Part")
+	public static class Part {
+		@Id
+		private Long id;
+		private String name;
+		private String stockNumber;
+
+		public Part() {
+		}
+
+		public Long getId() {
+			return id;
+		}
+
+		private void setId(Long id) {
+			this.id = id;
+		}
+
+		public String getName() {
+			return name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+
+		public String getStockNumber() {
+			return stockNumber;
+		}
+
+		public void setStockNumber(String stockNumber) {
+			this.stockNumber = stockNumber;
+		}
+
+	}
+}