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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.parser;
import java.util.List;
import net.hydromatic.optiq.tools.Planner;
import org.apache.drill.exec.ops.QueryContext;
import org.apache.drill.exec.planner.sql.handlers.AbstractSqlHandler;
import org.apache.drill.exec.planner.sql.handlers.ShowSchemasHandler;
import org.eigenbase.sql.SqlCall;
import org.eigenbase.sql.SqlKind;
import org.eigenbase.sql.SqlLiteral;
import org.eigenbase.sql.SqlNode;
import org.eigenbase.sql.SqlOperator;
import org.eigenbase.sql.SqlSpecialOperator;
import org.eigenbase.sql.SqlWriter;
import org.eigenbase.sql.parser.SqlParserPos;
import com.google.common.collect.Lists;
/**
* Sql parse tree node to represent statement:
* SHOW {DATABASES | SCHEMAS} [LIKE 'pattern' | WHERE expr]
*/
public class SqlShowSchemas extends DrillSqlCall {
private final SqlNode likePattern;
private final SqlNode whereClause;
public static final SqlSpecialOperator OPERATOR =
new SqlSpecialOperator("SHOW_SCHEMAS", SqlKind.OTHER){
public SqlCall createCall(SqlLiteral functionQualifier, SqlParserPos pos, SqlNode... operands) {
return new SqlShowSchemas(pos, operands[0], operands[1]);
}
};
public SqlShowSchemas(SqlParserPos pos, SqlNode likePattern, SqlNode whereClause) {
super(pos);
this.likePattern = likePattern;
this.whereClause = whereClause;
}
@Override
public SqlOperator getOperator() {
return OPERATOR;
}
@Override
public List<SqlNode> getOperandList() {
List<SqlNode> opList = Lists.newArrayList();
opList.add(likePattern);
opList.add(whereClause);
return opList;
}
@Override
public void unparse(SqlWriter writer, int leftPrec, int rightPrec) {
writer.keyword("SHOW");
writer.keyword("SCHEMAS");
if (likePattern != null) {
writer.keyword("LIKE");
likePattern.unparse(writer, leftPrec, rightPrec);
}
if (whereClause != null) whereClause.unparse(writer, leftPrec, rightPrec);
}
@Override
public AbstractSqlHandler getSqlHandler(Planner planner, QueryContext context) {
return new ShowSchemasHandler(planner, context);
}
public SqlNode getLikePattern() { return likePattern; }
public SqlNode getWhereClause() { return whereClause; }
}
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