/**
* 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.common.expression.parser;
import java.io.IOException;
import org.antlr.runtime.ANTLRStringStream;
import org.antlr.runtime.CommonTokenStream;
import org.antlr.runtime.RecognitionException;
import org.apache.drill.common.expression.ExpressionStringBuilder;
import org.apache.drill.common.expression.LogicalExpression;
import org.apache.drill.common.expression.parser.ExprParser.parse_return;
import org.apache.drill.test.DrillTest;
import org.junit.Test;
public class TreeTest extends DrillTest {
private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(TreeTest.class);
@Test
public void escapeStringLiteral() throws Exception {
String expr = "func(`identifier`, '\\\\d+', 0, 'fjds')";
testExpressionParsing(expr);
}
@Test
public void escapeQuotedIdentifier() throws Exception {
String expr = "`a\\\\b` + `c'd`";
testExpressionParsing(expr);
}
@Test
public void testIfWithCase() throws Exception{
testExpressionParsing("if ($F1) then case when (_MAP.R_NAME = 'AFRICA') then 2 else 4 end else if(4==3) then 1 else if(x==3) then 7 else (if(2==1) then 6 else 4 end) end");
}
@Test
public void testAdd() throws Exception{
testExpressionParsing("2+2");
}
@Test
public void testIf() throws Exception{
testExpressionParsing("if ('blue.red') then 'orange' else if (false) then 1 else 0 end");
}
@Test
public void testQuotedIdentifier() throws Exception{
testExpressionParsing("`hello friend`.`goodbye`");
}
@Test
public void testSpecialQuoted() throws Exception{
testExpressionParsing("`*0` + `*` ");
}
@Test
public void testQuotedIdentifier2() throws Exception{
testExpressionParsing("`hello friend`.goodbye");
}
@Test
public void testComplexIdentifier() throws Exception{
testExpressionParsing("goodbye[4].`hello`");
}
@Test // DRILL-2606
public void testCastToBooleanExpr() throws Exception{
testExpressionParsing("cast( (cast( (`bool_col` ) as VARCHAR(100) ) ) as BIT )");
}
private LogicalExpression parseExpression(String expr) throws RecognitionException, IOException{
ExprLexer lexer = new ExprLexer(new ANTLRStringStream(expr));
CommonTokenStream tokens = new CommonTokenStream(lexer);
// tokens.fill();
// for(Token t : (List<Token>) tokens.getTokens()){
// System.out.println(t + "" + t.getType());
// }
// tokens.rewind();
ExprParser parser = new ExprParser(tokens);
parse_return ret = parser.parse();
return ret.e;
}
private String serializeExpression(LogicalExpression expr){
ExpressionStringBuilder b = new ExpressionStringBuilder();
StringBuilder sb = new StringBuilder();
expr.accept(b, sb);
return sb.toString();
}
/**
* Attempt to parse an expression. Once parsed, convert it to a string and then parse it again to make sure serialization works.
* @param expr
* @throws RecognitionException
* @throws IOException
*/
private void testExpressionParsing(String expr) throws RecognitionException, IOException{
logger.debug("-----" + expr + "-----");
LogicalExpression e = parseExpression(expr);
String newStringExpr = serializeExpression(e);
logger.debug(newStringExpr);
LogicalExpression e2 = parseExpression(newStringExpr);
//Assert.assertEquals(e, e2);
}
}