HHH-9798 - Fix Unique constraint of @joincolumn in @jointable not generated

Author: dreab8

hibernate-core/src/main/java/org/hibernate/tool/schema/internal/StandardTableExporter.java

@@ -17,7 +17,9 @@
 import org.hibernate.dialect.Dialect;
 import org.hibernate.engine.jdbc.env.spi.JdbcEnvironment;
 import org.hibernate.mapping.Column;
+import org.hibernate.mapping.Constraint;
 import org.hibernate.mapping.Table;
+import org.hibernate.mapping.UniqueKey;
 import org.hibernate.tool.schema.spi.Exporter;
 
 /**
@@ -105,6 +107,16 @@ public String[] getSqlCreateStrings(Table table, Metadata metadata) {
 
 			}
 
+			if ( col.isUnique() ) {
+				String keyName = Constraint.generateName( "UK_", table, col );
+				UniqueKey uk = table.getOrCreateUniqueKey( keyName );
+				uk.addColumn( col );
+				buf.append(
+						dialect.getUniqueDelegate()
+								.getColumnDefinitionUniquenessFragment( col )
+				);
+			}
+
 			if ( col.getCheckConstraint() != null && dialect.supportsColumnCheck() ) {
 				buf.append( " check (" )
 						.append( col.getCheckConstraint() )