Skip field validation for compatiblity

Author: psainics

database-commons/src/main/java/io/cdap/plugin/db/source/AbstractDBSource.java

@@ -529,7 +529,7 @@ public void validateSchema(Schema actualSchema, FailureCollector collector) {
     }
 
     @VisibleForTesting
-    static void validateSchema(Schema actualSchema, Schema configSchema, FailureCollector collector) {
+    void validateSchema(Schema actualSchema, Schema configSchema, FailureCollector collector) {
       if (configSchema == null) {
         collector.addFailure("Schema should not be null or empty.", null)
           .withConfigProperty(SCHEMA);
@@ -550,14 +550,20 @@ static void validateSchema(Schema actualSchema, Schema configSchema, FailureColl
         Schema expectedFieldSchema = field.getSchema().isNullable() ?
           field.getSchema().getNonNullable() : field.getSchema();
 
-        if (actualFieldSchema.getType() != expectedFieldSchema.getType() ||
-          actualFieldSchema.getLogicalType() != expectedFieldSchema.getLogicalType()) {
-          collector.addFailure(
-            String.format("Schema field '%s' has type '%s but found '%s'.",
-                          field.getName(), expectedFieldSchema.getDisplayName(),
-                          actualFieldSchema.getDisplayName()), null)
-            .withOutputSchemaField(field.getName());
-        }
+        validateField(collector, field, actualFieldSchema, expectedFieldSchema);
+      }
+    }
+
+    protected void validateField(FailureCollector collector, Schema.Field field, Schema actualFieldSchema,
+                                 Schema expectedFieldSchema) {
+      if (actualFieldSchema.getType() != expectedFieldSchema.getType() ||
+        actualFieldSchema.getLogicalType() != expectedFieldSchema.getLogicalType()) {
+        collector.addFailure(
+            String.format("Schema field '%s' is expected to have type '%s but found '%s'.", field.getName(),
+              expectedFieldSchema.getDisplayName(), actualFieldSchema.getDisplayName()),
+            String.format("Change the data type of field %s to %s.", field.getName(),
+              actualFieldSchema.getDisplayName()))
+          .withOutputSchemaField(field.getName());
       }
     }
 

database-commons/src/test/java/io/cdap/plugin/db/source/AbstractDBSourceTest.java

@@ -43,11 +43,17 @@ public class AbstractDBSourceTest {
     Schema.Field.of("double_column", Schema.nullableOf(Schema.of(Schema.Type.DOUBLE))),
     Schema.Field.of("boolean_column", Schema.nullableOf(Schema.of(Schema.Type.BOOLEAN)))
   );
+  private static final AbstractDBSource.DBSourceConfig TEST_CONFIG = new AbstractDBSource.DBSourceConfig() {
+    @Override
+    public String getConnectionString() {
+      return "";
+    }
+  };
 
   @Test
   public void testValidateSourceSchemaCorrectSchema() {
     MockFailureCollector collector = new MockFailureCollector(MOCK_STAGE);
-    AbstractDBSource.DBSourceConfig.validateSchema(SCHEMA, SCHEMA, collector);
+    TEST_CONFIG.validateSchema(SCHEMA, SCHEMA, collector);
     Assert.assertEquals(0, collector.getValidationFailures().size());
   }
 
@@ -65,7 +71,7 @@ public void testValidateSourceSchemaMismatchFields() {
     );
 
     MockFailureCollector collector = new MockFailureCollector(MOCK_STAGE);
-    AbstractDBSource.DBSourceConfig.validateSchema(actualSchema, SCHEMA, collector);
+    TEST_CONFIG.validateSchema(actualSchema, SCHEMA, collector);
     assertPropertyValidationFailed(collector, "boolean_column");
   }
 
@@ -84,7 +90,7 @@ public void testValidateSourceSchemaInvalidFieldType() {
     );
 
     MockFailureCollector collector = new MockFailureCollector(MOCK_STAGE);
-    AbstractDBSource.DBSourceConfig.validateSchema(actualSchema, SCHEMA, collector);
+    TEST_CONFIG.validateSchema(actualSchema, SCHEMA, collector);
     assertPropertyValidationFailed(collector, "boolean_column");
   }
 

mariadb-plugin/src/main/java/io/cdap/plugin/mariadb/MariadbFieldsValidator.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright © 2025 Cask Data, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+package io.cdap.plugin.mariadb;
+
+import io.cdap.plugin.mysql.MysqlFieldsValidator;
+
+/**
+ * Field validator for maraidb
+ */
+public class MariadbFieldsValidator extends MysqlFieldsValidator {
+}

mariadb-plugin/src/main/java/io/cdap/plugin/mariadb/MariadbSink.java

@@ -25,6 +25,8 @@
 import io.cdap.plugin.db.SchemaReader;
 import io.cdap.plugin.db.config.DBSpecificSinkConfig;
 import io.cdap.plugin.db.sink.AbstractDBSink;
+import io.cdap.plugin.db.sink.FieldsValidator;
+import io.cdap.plugin.mysql.MysqlFieldsValidator;
 import io.cdap.plugin.util.DBUtils;
 
 import java.util.Map;
@@ -70,6 +72,11 @@ protected String getExternalDocumentationLink() {
     return DBUtils.MARIADB_SUPPORTED_DOC_URL;
   }
 
+  @Override
+  protected FieldsValidator getFieldsValidator() {
+    return new MariadbFieldsValidator();
+  }
+
   /**
    * MariaDB Sink Config.
    */

mariadb-plugin/src/main/java/io/cdap/plugin/mariadb/MariadbSource.java

@@ -19,6 +19,8 @@
 import io.cdap.cdap.api.annotation.Description;
 import io.cdap.cdap.api.annotation.Name;
 import io.cdap.cdap.api.annotation.Plugin;
+import io.cdap.cdap.api.data.schema.Schema;
+import io.cdap.cdap.etl.api.FailureCollector;
 import io.cdap.cdap.etl.api.batch.BatchSource;
 import io.cdap.cdap.etl.api.batch.BatchSourceContext;
 import io.cdap.plugin.common.Asset;
@@ -172,5 +174,30 @@ public Map<String, String> getConnectionArguments() {
       arguments.putIfAbsent(MARIADB_TINYINT1_IS_BIT, "false");
       return arguments;
     }
+
+    @Override
+    protected void validateField(FailureCollector collector,
+                                 Schema.Field field,
+                                 Schema actualFieldSchema,
+                                 Schema expectedFieldSchema) {
+      // Backward compatibility changes to support MySQL YEAR to Date type conversion
+      if (Schema.LogicalType.DATE.equals(expectedFieldSchema.getLogicalType())
+        && Schema.Type.INT.equals(actualFieldSchema.getType())) {
+        return;
+      }
+
+      // Backward compatibility change to support MySQL MEDIUMINT UNSIGNED to Long type conversion
+      if (Schema.Type.LONG.equals(expectedFieldSchema.getType())
+        && Schema.Type.INT.equals(actualFieldSchema.getType())) {
+        return;
+      }
+
+      // Backward compatibility change to support MySQL TINYINT(1) to Bool type conversion
+      if (Schema.Type.BOOLEAN.equals(expectedFieldSchema.getType())
+        && Schema.Type.INT.equals(actualFieldSchema.getType())) {
+        return;
+      }
+      super.validateField(collector, field, actualFieldSchema, expectedFieldSchema);
+    }
   }
 }