Class TestSchemaAliasVisitor

test/org/apache/pig/parser/TestSchemaAliasVisitor.java:32–92

import org.junit.Test;

public class TestSchemaAliasVisitor {

    @Test
    public void test() throws RecognitionException, ParsingFailureException, IOException {
        String query = "A = load 'x' as ( u:int, v:long, w:bytearray); " + 
                       "B = foreach A generate u, v, $0 as x, u as z; " +
                       "C = store B into 'output';";
        validate( query );
    }
    
    @Test
    public void testNegative1() throws RecognitionException, ParsingFailureException, IOException {
        String query = "A = load 'x' as ( u:int, v:long, w:bytearray); " + 
                       "B = foreach A generate $0, v, $0; " +
                       "C = store B into 'output';";
        try {
            validate( query );
        } catch(PlanValidationException ex) {
            Assert.assertTrue( ex.getMessage().contains( "Duplicate schema alias" ) );
            return;
        }
        Assert.fail( "Query should fail to validate." );
    }

    @Test
    // See PIG-644
    public void testNegative2() throws RecognitionException, ParsingFailureException, IOException {
         String query = "a = load '1.txt' as (a0:int, a1:int);" + 
                        "b = foreach a generate a0, a1 as a0;" +
                        "c = store b into 'output';";
         try {
             validate( query );
         } catch(PlanValidationException ex) {
             Assert.assertTrue( ex.getMessage().contains( "Duplicate schema alias" ) );
             return;
         }
         Assert.fail( "Query should fail to validate." );
     }
     
    @Test
    // See PIG-644
    public void testNegative3() throws RecognitionException, ParsingFailureException, IOException {
        String query = "a = load '1.txt' as (a0:int, a0:int);" + 
                       "store a into 'output';";
        try {
            validate( query );
        } catch(RecognitionException ex) {
            Assert.assertTrue( ex.toString().contains( "Duplicated alias in schema" ) );
            return;
        }
        Assert.fail( "Query should fail to validate." );
    }

    private LogicalPlan validate(String query) throws RecognitionException, ParsingFailureException, IOException {
        LogicalPlan plan = ParserTestingUtils.generateLogicalPlan( query );
        SchemaAliasVisitor visitor = new SchemaAliasVisitor( plan );
        visitor.visit();
        return plan;