Fix types handling

src/main/java/liquibase/ext/hibernate/diff/ChangedColumnChangeGenerator.java

@@ -0,0 +1,78 @@
+package liquibase.ext.hibernate.diff;
+
+import liquibase.change.Change;
+import liquibase.database.Database;
+import liquibase.diff.Difference;
+import liquibase.diff.ObjectDifferences;
+import liquibase.diff.output.DiffOutputControl;
+import liquibase.ext.hibernate.database.HibernateDatabase;
+import liquibase.statement.DatabaseFunction;
+import liquibase.structure.DatabaseObject;
+import liquibase.structure.core.Column;
+import liquibase.structure.core.DataType;
+
+import java.util.List;
+
+/**
+ * Hibernate and database types tend to look different even though they are not.
+ * The only change that we are handling it size change, and even for this one there are exceptions.
+ */
+public class ChangedColumnChangeGenerator extends liquibase.diff.output.changelog.core.ChangedColumnChangeGenerator {
+
+    private static final List<String> TYPES_TO_IGNORE_SIZE = List.of("TIMESTAMP");
+
+    @Override
+    public int getPriority(Class<? extends DatabaseObject> objectType, Database database) {
+        if (Column.class.isAssignableFrom(objectType)) {
+            return PRIORITY_ADDITIONAL;
+        }
+        return PRIORITY_NONE;
+    }
+
+    @Override
+    protected void handleTypeDifferences(Column column, ObjectDifferences differences, DiffOutputControl control, List<Change> changes, Database referenceDatabase, Database comparisonDatabase) {
+        if (referenceDatabase instanceof HibernateDatabase || comparisonDatabase instanceof HibernateDatabase) {
+            handleSizeChange(column, differences, control, changes, referenceDatabase, comparisonDatabase);
+        } else {
+            super.handleTypeDifferences(column, differences, control, changes, referenceDatabase, comparisonDatabase);
+        }
+    }
+
+    private void handleSizeChange(Column column, ObjectDifferences differences, DiffOutputControl control, List<Change> changes, Database referenceDatabase, Database comparisonDatabase) {
+        if (TYPES_TO_IGNORE_SIZE.stream().anyMatch(s -> s.equalsIgnoreCase(column.getType().getTypeName()))) {
+            return;
+        }
+        Difference difference = differences.getDifference("type");
+        if (difference != null) {
+            for (Difference d : differences.getDifferences()) {
+                if (!(d.getReferenceValue() instanceof DataType)) {
+                    differences.removeDifference(d.getField());
+                    continue;
+                }
+                Integer originalSize = ((DataType) d.getReferenceValue()).getColumnSize();
+                Integer newSize = ((DataType) d.getComparedValue()).getColumnSize();
+                if (newSize == null || originalSize == null || newSize.equals(originalSize)) {
+                    differences.removeDifference(d.getField());
+                }
+            }
+            super.handleTypeDifferences(column, differences, control, changes, referenceDatabase, comparisonDatabase);
+        }
+    }
+
+    @Override
+    protected void handleDefaultValueDifferences(Column column, ObjectDifferences differences, DiffOutputControl control, List<Change> changes, Database referenceDatabase, Database comparisonDatabase) {
+        if (referenceDatabase instanceof HibernateDatabase || comparisonDatabase instanceof HibernateDatabase) {
+            Difference difference = differences.getDifference("defaultValue");
+            if (difference != null && difference.getReferenceValue() == null && difference.getComparedValue() instanceof DatabaseFunction) {
+                //database sometimes adds a function default value, like for timestamp columns
+                return;
+            }
+            difference = differences.getDifference("defaultValue");
+            if (difference != null) {
+                super.handleDefaultValueDifferences(column, differences, control, changes, referenceDatabase, comparisonDatabase);
+            }
+            // do nothing, types tend to not match with hibernate
+        }
+        super.handleDefaultValueDifferences(column, differences, control, changes, referenceDatabase, comparisonDatabase);
+    }
+}

src/main/resources/META-INF/services/liquibase.diff.output.changelog.ChangeGenerator

@@ -1,3 +1,4 @@
+liquibase.ext.hibernate.diff.ChangedColumnChangeGenerator
 liquibase.ext.hibernate.diff.ChangedForeignKeyChangeGenerator
 liquibase.ext.hibernate.diff.ChangedSequenceChangeGenerator
 liquibase.ext.hibernate.diff.MissingSequenceChangeGenerator