HHH-18797 Add JSON aggregate support for HANA

Author: beikov

hibernate-community-dialects/src/main/java/org/hibernate/community/dialect/HANALegacyDialect.java

@@ -52,6 +52,8 @@
 import org.hibernate.dialect.NullOrdering;
 import org.hibernate.dialect.OracleDialect;
 import org.hibernate.dialect.RowLockStrategy;
+import org.hibernate.dialect.aggregate.AggregateSupport;
+import org.hibernate.dialect.aggregate.HANAAggregateSupport;
 import org.hibernate.dialect.function.CommonFunctionFactory;
 import org.hibernate.dialect.function.IntegralTimestampaddFunction;
 import org.hibernate.dialect.identity.HANAIdentityColumnSupport;
@@ -534,6 +536,11 @@ protected <T extends JdbcOperation> SqlAstTranslator<T> buildTranslator(
 		};
 	}
 
+	@Override
+	public AggregateSupport getAggregateSupport() {
+		return HANAAggregateSupport.valueOf( this );
+	}
+
 	/**
 	 * HANA has no extract() function, but we can emulate
 	 * it using the appropriate named functions instead of

hibernate-core/src/main/java/org/hibernate/dialect/HANADialect.java

@@ -13,6 +13,8 @@
 import org.hibernate.boot.model.TypeContributions;
 import org.hibernate.boot.model.naming.Identifier;
 import org.hibernate.boot.model.relational.SqlStringGenerationContext;
+import org.hibernate.dialect.aggregate.AggregateSupport;
+import org.hibernate.dialect.aggregate.HANAAggregateSupport;
 import org.hibernate.dialect.function.CommonFunctionFactory;
 import org.hibernate.dialect.function.IntegralTimestampaddFunction;
 import org.hibernate.dialect.identity.HANAIdentityColumnSupport;
@@ -536,6 +538,11 @@ protected <T extends JdbcOperation> SqlAstTranslator<T> buildTranslator(
 		};
 	}
 
+	@Override
+	public AggregateSupport getAggregateSupport() {
+		return HANAAggregateSupport.valueOf( this );
+	}
+
 	/**
 	 * HANA has no extract() function, but we can emulate
 	 * it using the appropriate named functions instead of