Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/21306#discussion_r200236259 --- Diff: sql/core/src/main/java/org/apache/spark/sql/sources/v2/catalog/TableCatalog.java --- @@ -0,0 +1,123 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You 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.sources.v2.catalog; + +import org.apache.spark.sql.catalyst.TableIdentifier; +import org.apache.spark.sql.catalyst.analysis.NoSuchTableException; +import org.apache.spark.sql.catalyst.analysis.TableAlreadyExistsException; +import org.apache.spark.sql.catalyst.expressions.Expression; +import org.apache.spark.sql.types.StructType; + +import java.util.Arrays; +import java.util.Collections; +import java.util.List; +import java.util.Map; + +public interface TableCatalog { + /** + * Load table metadata by {@link TableIdentifier identifier} from the catalog. + * + * @param ident a table identifier + * @return the table's metadata + * @throws NoSuchTableException If the table doesn't exist. + */ + Table loadTable(TableIdentifier ident) throws NoSuchTableException; + + /** + * Create a table in the catalog. + * + * @param ident a table identifier + * @param schema the schema of the new table, as a struct type + * @return metadata for the new table + * @throws TableAlreadyExistsException If a table already exists for the identifier + */ + default Table createTable(TableIdentifier ident, + StructType schema) throws TableAlreadyExistsException { + return createTable(ident, schema, Collections.emptyList(), Collections.emptyMap()); + } + + /** + * Create a table in the catalog. + * + * @param ident a table identifier + * @param schema the schema of the new table, as a struct type + * @param properties a string map of table properties + * @return metadata for the new table + * @throws TableAlreadyExistsException If a table already exists for the identifier + */ + default Table createTable(TableIdentifier ident, + StructType schema, + Map<String, String> properties) throws TableAlreadyExistsException { + return createTable(ident, schema, Collections.emptyList(), properties); + } + + /** + * Create a table in the catalog. + * + * @param ident a table identifier + * @param schema the schema of the new table, as a struct type + * @param partitions a list of expressions to use for partitioning data in the table + * @param properties a string map of table properties + * @return metadata for the new table + * @throws TableAlreadyExistsException If a table already exists for the identifier + */ + Table createTable(TableIdentifier ident, + StructType schema, + List<Expression> partitions, --- End diff -- why it's expressions? In current Spark we only support PARTITION BY columns.
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