Error checking column similarity between join tables

[kyungtaak]

Describe the bug
Calling a query that checks the column similarity between join tables results in an error.

To Reproduce
Call query API with request body as bellow

{
  "queryType": "unionAll",
  "query": {
    "queryType": "sketch",
    "dataSource": {
      "type": "union",
      "dataSources": [
        "master","join"
      ]
    },
    "intervals": [
      "1900-01-01T00:00:00.0Z/2051-01-01T00:00:00.0Z"
    ]
  },
  "context": {
    "postProcessing": {
      "type": "similarity"
    },
    "allColumnsForEmpty": true
  }
}

Response

{
    "error": "Unknown exception",
    "errorMessage": "java.lang.Long cannot be cast to java.lang.String",
    "errorClass": "java.lang.ClassCastException",
    "errorStack": [
        "io.druid.query.sketch.SketchHandler$Theta.updateWithValue(SketchHandler.java:214)",
        "io.druid.query.sketch.SketchQueryRunner$1.accumulate(SketchQueryRunner.java:286)",
        "io.druid.query.sketch.SketchQueryRunner$1.accumulate(SketchQueryRunner.java:224)",
        "com.metamx.common.guava.FilteringAccumulator.accumulate(FilteringAccumulator.java:40)",
        "com.metamx.common.guava.MappingAccumulator.accumulate(MappingAccumulator.java:39)",
        "com.metamx.common.guava.BaseSequence.accumulate(BaseSequence.java:67)",
        "com.metamx.common.guava.MappedSequence.accumulate(MappedSequence.java:40)",
        "com.metamx.common.guava.ResourceClosingSequence.accumulate(ResourceClosingSequence.java:38)",
        "com.metamx.common.guava.FilteredSequence.accumulate(FilteredSequence.java:42)",
        "... more"
    ],
    "host": "metatron-web-05:8083",
    "serviceName": "druid/historical"
}

Error log : error.log

Additional context

[navis]

Regression from #1178.. time column should not be included for 'allColumnsForEmpty' things. Who fuck did made that silly option?

[navis]

Fixed