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spark/src/main/scala/org/apache/spark/sql/delta/commands/columnmapping/RemoveColumnMappingCommand.scala

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+/*
+ * Copyright (2021) The Delta Lake Project Authors.
+ *
+ * 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 org.apache.spark.sql.delta.commands.columnmapping
+
+import org.apache.spark.sql.delta.{DeltaErrors, DeltaLog}
+import org.apache.spark.sql.delta.schema.{ImplicitMetadataOperation, SchemaUtils}
+
+import org.apache.spark.sql.{Row, SparkSession}
+import org.apache.spark.sql.catalyst.catalog.CatalogTable
+import org.apache.spark.sql.types.StructType
+
+class RemoveColumnMappingCommand(deltaLog: DeltaLog, catalogOpt: Option[CatalogTable])
+  extends ImplicitMetadataOperation {
+  override protected val canMergeSchema: Boolean = false
+  override protected val canOverwriteSchema: Boolean = true
+
+  /**
+   * Remove the column mapping from the table.
+   * @param removeColumnMappingTableProperty - whether to remove the column mapping property from
+   *                                         the table instead of setting it to 'none'
+   */
+  def run(spark: SparkSession, removeColumnMappingTableProperty: Boolean): Unit = {
+    val schema = deltaLog.update().schema
+    verifySchemaFieldNames(schema)
+  }
+
+  /**
+   * Verify none of the schema fields contain invalid column names.
+   */
+  private def verifySchemaFieldNames(schema: StructType) = {
+    val invalidColumnNames =
+      SchemaUtils.findInvalidColumnNamesInSchema(schema)
+    if (invalidColumnNames.nonEmpty) {
+      throw DeltaErrors
+        .foundInvalidColumnNamesWhenRemovingColumnMapping(invalidColumnNames)
+    }
+  }
+}