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/**
* 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.planner.sql.handlers;
import java.io.IOException;
import java.util.List;
import net.hydromatic.optiq.SchemaPlus;
import net.hydromatic.optiq.tools.Planner;
import net.hydromatic.optiq.tools.RelConversionException;
import net.hydromatic.optiq.tools.ValidationException;
import org.apache.drill.exec.ops.QueryContext;
import org.apache.drill.exec.physical.PhysicalPlan;
import org.apache.drill.exec.physical.base.PhysicalOperator;
import org.apache.drill.exec.planner.logical.DrillRel;
import org.apache.drill.exec.planner.logical.DrillScreenRel;
import org.apache.drill.exec.planner.logical.DrillStoreRel;
import org.apache.drill.exec.planner.logical.DrillWriterRel;
import org.apache.drill.exec.planner.physical.Prel;
import org.apache.drill.exec.planner.sql.DirectPlan;
import org.apache.drill.exec.planner.sql.DrillSqlWorker;
import org.apache.drill.exec.planner.sql.parser.SqlCreateTable;
import org.apache.drill.exec.planner.types.DrillFixedRelDataTypeImpl;
import org.apache.drill.exec.store.AbstractSchema;
import org.eigenbase.rel.RelNode;
import org.eigenbase.relopt.RelOptUtil;
import org.eigenbase.reltype.RelDataType;
import org.eigenbase.sql.SqlNode;
public class CreateTableHandler extends DefaultSqlHandler {
public CreateTableHandler(Planner planner, QueryContext context) {
super(planner, context);
}
@Override
public PhysicalPlan getPlan(SqlNode sqlNode) throws ValidationException, RelConversionException, IOException {
SqlCreateTable sqlCreateTable = unwrap(sqlNode, SqlCreateTable.class);
try {
// Convert the query in CTAS statement into a RelNode
SqlNode validatedQuery = validateNode(sqlCreateTable.getQuery());
RelNode relQuery = convertToRel(validatedQuery);
List<String> tblFiledNames = sqlCreateTable.getFieldNames();
RelDataType queryRowType = relQuery.getRowType();
if (tblFiledNames.size() > 0) {
// Field count should match.
if (tblFiledNames.size() != queryRowType.getFieldCount())
return DirectPlan.createDirectPlan(context, false,
"Table's field list and the table's query field list have different counts.");
// CTAS's query field list shouldn't have "*" when table's field list is specified.
for(String field : queryRowType.getFieldNames()) {
if (field.equals("*"))
return DirectPlan.createDirectPlan(context, false,
"Table's query field list has a '*', which is invalid when table's field list is specified.");
}
}
// if the CTAS statement has table fields lists (ex. below), add a project rel to rename the query fields.
// Ex. CREATE TABLE tblname(col1, medianOfCol2, avgOfCol3) AS
// SELECT col1, median(col2), avg(col3) FROM sourcetbl GROUP BY col1 ;
if (tblFiledNames.size() > 0) {
// create rowtype to which the select rel needs to be casted.
RelDataType rowType = new DrillFixedRelDataTypeImpl(planner.getTypeFactory(), tblFiledNames);
relQuery = RelOptUtil.createCastRel(relQuery, rowType, true);
}
SchemaPlus schema = findSchema(context.getRootSchema(), context.getNewDefaultSchema(),
sqlCreateTable.getSchemaPath());
AbstractSchema drillSchema = getDrillSchema(schema);
if (!drillSchema.isMutable())
return DirectPlan.createDirectPlan(context, false, String.format("Current schema '%s' is not a mutable schema. " +
"Can't create tables in this schema.", drillSchema.getFullSchemaName()));
String newTblName = sqlCreateTable.getName();
if (schema.getTable(newTblName) != null) {
return DirectPlan.createDirectPlan(context, false, String.format("Table '%s' already exists.", newTblName));
}
log("Optiq Logical", relQuery);
// Convert the query to Drill Logical plan and insert a writer operator on top.
DrillRel drel = convertToDrel(relQuery, drillSchema, newTblName);
log("Drill Logical", drel);
Prel prel = convertToPrel(drel);
log("Drill Physical", prel);
PhysicalOperator pop = convertToPop(prel);
PhysicalPlan plan = convertToPlan(pop);
log("Drill Plan", plan);
return plan;
} catch(Exception e) {
logger.error("Failed to create table '{}'", sqlCreateTable.getName(), e);
return DirectPlan.createDirectPlan(context, false, String.format("Error: %s", e.getMessage()));
}
}
private DrillRel convertToDrel(RelNode relNode, AbstractSchema schema, String tableName) throws RelConversionException {
RelNode convertedRelNode = planner.transform(DrillSqlWorker.LOGICAL_RULES,
relNode.getTraitSet().plus(DrillRel.DRILL_LOGICAL), relNode);
if (convertedRelNode instanceof DrillStoreRel)
throw new UnsupportedOperationException();
DrillWriterRel writerRel = new DrillWriterRel(convertedRelNode.getCluster(), convertedRelNode.getTraitSet(),
convertedRelNode, schema.createNewTable(tableName));
return new DrillScreenRel(writerRel.getCluster(), writerRel.getTraitSet(), writerRel);
}
}
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