[GitHub] spark pull request: [SPARK-13477][SQL] Expose new user-facing Cata...

[andrewor14 <gi...@git.apache.org>]

Github user andrewor14 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/12713#discussion_r61190163
  
    --- Diff: sql/core/src/main/scala/org/apache/spark/sql/catalog/Catalog.scala ---
    @@ -0,0 +1,209 @@
    +/*
    + * 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.catalog
    +
    +import org.apache.spark.annotation.Experimental
    +import org.apache.spark.sql.{AnalysisException, DataFrame}
    +import org.apache.spark.sql.types.StructType
    +
    +
    +// TODO: make these methods return Datasets instead of Array
    +
    +/**
    + * Catalog interface for Spark. To access this, use `SparkSession.catalog`.
    + */
    +abstract class Catalog {
    +
    +  /**
    +   * Returns the current default database in this session.
    +   */
    +  def currentDatabase: String
    +
    +  /**
    +   * Sets the current default database in this session.
    +   */
    +  def setCurrentDatabase(dbName: String): Unit
    +
    +  /**
    +   * Returns a list of databases available across all sessions.
    +   */
    +  def listDatabases(): Array[Database]
    +
    +  /**
    +   * Returns a list of tables in the current database.
    +   * This includes all temporary tables.
    +   */
    +  def listTables(): Array[Table]
    +
    +  /**
    +   * Returns a list of tables in the specified database.
    +   * This includes all temporary tables.
    +   */
    +  @throws[AnalysisException]("database does not exist")
    +  def listTables(dbName: String): Array[Table]
    +
    +  /**
    +   * Returns a list of functions registered in the current database.
    +   * This includes all temporary functions
    +   */
    +  def listFunctions(): Array[Function]
    +
    +  /**
    +   * Returns a list of functions registered in the specified database.
    +   * This includes all temporary functions
    +   */
    +  @throws[AnalysisException]("database does not exist")
    +  def listFunctions(dbName: String): Array[Function]
    +
    +  /**
    +   * Returns a list of columns for the given table in the current database.
    +   */
    +  @throws[AnalysisException]("table does not exist")
    +  def listColumns(tableName: String): Array[Column]
    +
    +  /**
    +   * Returns a list of columns for the given table in the specified database.
    --- End diff --
    
    add some annotations


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