public Fluent explainContains(String expected) throws ParseException {
final Ast.Program program = parseProgram(pig);
final PigRelBuilder builder =
PigRelBuilder.create(PigRelBuilderTest.config().build());
new Handler(builder).handle(program);
assertThat(Util.toLinux(RelOptUtil.toString(builder.peek())), is(expected));
return this;
}
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