{
  "head" : {
    "type" : "APACHE_DRILL_LOGICAL",
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    "generator" : {
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      "info" : "na"
    }
  },
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  }, {
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    "projections" : [ {
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    }, {
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      "expr" : "_MAP.b"
    } ]
  }, {
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    "orderings" : [ {
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      "expr" : "EXPR$0",
      "nullCollation" : "NULLS_LAST"
    } ]
  }, {
    "op" : "store",
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    "memo" : "output sink",
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    "target" : {
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    },
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    "storageEngine" : "queue"
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}