/**
* 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.drill.exec.store.ischema;
import org.apache.calcite.rel.type.RelDataType;
import org.apache.calcite.rel.type.RelDataTypeFactory;
import org.apache.calcite.schema.SchemaPlus;
import org.apache.drill.exec.server.options.OptionManager;
import org.apache.drill.exec.store.ischema.InfoSchemaTable.Catalogs;
import org.apache.drill.exec.store.ischema.InfoSchemaTable.Columns;
import org.apache.drill.exec.store.ischema.InfoSchemaTable.Schemata;
import org.apache.drill.exec.store.ischema.InfoSchemaTable.Tables;
import org.apache.drill.exec.store.ischema.InfoSchemaTable.Views;
import org.apache.drill.exec.store.pojo.PojoRecordReader;
/**
* The set of tables/views in INFORMATION_SCHEMA.
*/
public enum InfoSchemaTableType {
// TODO: Resolve how to not have two different place defining table names:
// NOTE: These identifiers have to match the string values in
// InfoSchemaConstants.
CATALOGS(new Catalogs()),
SCHEMATA(new Schemata()),
VIEWS(new Views()),
COLUMNS(new Columns()),
TABLES(new Tables());
private final InfoSchemaTable<?> tableDef;
/**
* ...
* @param tableDef the definition (columns and data generator) of the table
*/
InfoSchemaTableType(InfoSchemaTable<?> tableDef) {
this.tableDef = tableDef;
}
public <S> PojoRecordReader<S> getRecordReader(SchemaPlus rootSchema, InfoSchemaFilter filter, OptionManager optionManager) {
@SuppressWarnings("unchecked")
InfoSchemaRecordGenerator<S> recordGenerator = (InfoSchemaRecordGenerator<S>) tableDef.getRecordGenerator(optionManager);
recordGenerator.setInfoSchemaFilter(filter);
recordGenerator.scanSchema(rootSchema);
return recordGenerator.getRecordReader();
}
public RelDataType getRowType(RelDataTypeFactory typeFactory) {
return tableDef.getRowType(typeFactory);
}
}