hive.optimize.union.remove=true doesn't work with insert into

@Test
  public void testToAcidConversionMultiBucket() throws Exception {
    hiveConf.setBoolVar(HiveConf.ConfVars.HIVE_OPTIMIZE_UNION_REMOVE, true);
    hiveConf.setVar(HiveConf.ConfVars.HIVEFETCHTASKCONVERSION, "none");
    d.close();
    d = new Driver(hiveConf);
    int[][] values = {{1,2},{3,4},{5,6},{7,8},{9,10}};
    runStatementOnDriver("insert into " + Table.ACIDTBL + makeValuesClause(values));
    runStatementOnDriver("drop table if exists T");
    runStatementOnDriver("create table T (a int, b int) stored as ORC  TBLPROPERTIES ('transactional'='false')");//todo: try with T bucketd
//    runStatementOnDriver("insert into T select a,b from (" + "select a, b from " + Table.ACIDTBL + " where a <= 5 union all select a, b from " + Table.ACIDTBL + " where a >= 5" + ") S order by a, b");
    runStatementOnDriver("insert into T(a,b) select a, b from " + Table.ACIDTBL + " where a between 1 and 3 group by a, b union all select a, b from " + Table.ACIDTBL + " where a between 5 and 7 union all select a, b from " + Table.ACIDTBL + " where a >= 9");
    List<String> rs = runStatementOnDriver("select a, b, INPUT__FILE__NAME from T order by a, b, INPUT__FILE__NAME");
    LOG.warn("before converting to acid");
    for(String s : rs) {
      LOG.warn(s);
    }

ekoifman:apache-hive-3.0.0-SNAPSHOT-bin ekoifman$ tree ~/dev/hiverwgit/ql/target/tmp/org.apache.hadoop.hive.ql.TestTxnNoBuckets-1505153866252/warehouse/t/.hive-staging_hive_2017-09-11_11-18-48_614_1924461543400304640-1/
/Users/ekoifman/dev/hiverwgit/ql/target/tmp/org.apache.hadoop.hive.ql.TestTxnNoBuckets-1505153866252/warehouse/t/.hive-staging_hive_2017-09-11_11-18-48_614_1924461543400304640-1/
├── -ext-10002
│   ├── 19
│   │   └── 000000_0
│   ├── 20
│   │   └── 000000_0
│   └── 21
│       └── 000000_0
└── _tmp.-ext-10000

5 directories, 3 files

    if (srcs == null) {
      LOG.info("No sources specified to move: " + srcf);
      return;
      // srcs = new FileStatus[0]; Why is this needed?
    }

ekoifman:apache-hive-3.0.0-SNAPSHOT-bin ekoifman$ ./bin/hive --orcfiledump -d -j  ~/dev/hiverwgit/ql/target/tmp/org.apache.hadoop.hive.ql.TestTxnNoBuckets-1505153866252/warehouse/t/.hive-staging_hive_2017-09-11_11-18-48_614_1924461543400304640-1/
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/Users/ekoifman/dev/hiverwcommit/packaging/target/apache-hive-3.0.0-SNAPSHOT-bin/apache-hive-3.0.0-SNAPSHOT-bin/lib/log4j-slf4j-impl-2.6.2.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/Users/ekoifman/dev/hwxhadoop/hadoop-dist/target/hadoop-2.7.3.2.6.0.0-SNAPSHOT/share/hadoop/common/lib/slf4j-log4j12-1.7.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.apache.logging.slf4j.Log4jLoggerFactory]
Processing data file file:/Users/ekoifman/dev/hiverwgit/ql/target/tmp/org.apache.hadoop.hive.ql.TestTxnNoBuckets-1505153866252/warehouse/t/.hive-staging_hive_2017-09-11_11-18-48_614_1924461543400304640-1/-ext-10002/19/000000_0 [length: 242]
{"a":1,"b":2}
{"a":3,"b":4}
________________________________________________________________________________________________________________________

Processing data file file:/Users/ekoifman/dev/hiverwgit/ql/target/tmp/org.apache.hadoop.hive.ql.TestTxnNoBuckets-1505153866252/warehouse/t/.hive-staging_hive_2017-09-11_11-18-48_614_1924461543400304640-1/-ext-10002/20/000000_0 [length: 243]
{"a":7,"b":8}
{"a":5,"b":6}
________________________________________________________________________________________________________________________

Processing data file file:/Users/ekoifman/dev/hiverwgit/ql/target/tmp/org.apache.hadoop.hive.ql.TestTxnNoBuckets-1505153866252/warehouse/t/.hive-staging_hive_2017-09-11_11-18-48_614_1924461543400304640-1/-ext-10002/21/000000_0 [length: 242]
{"a":9,"b":10}
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