{
  "head" : {
    "version" : 1,
    "generator" : {
      "type" : "org.apache.drill.exec.planner.logical.DrillImplementor",
      "info" : ""
    },
    "type" : "APACHE_DRILL_PHYSICAL",
    "resultMode" : "EXEC"
  },
  "graph" : [ {
    "@id" : 1,
    "pop" : "fs-scan",
    "format" : {
      "type" : "json"
    },
    "storage" : {
      "type" : "file",
      "connection" : "classpath:///",
      "enabled" : true
    },
    "files" : [ "#{TEST_FILE}" ]
  }, {
    "pop" : "project",
    "@id" : 2,
    "exprs" : [ {
      "ref" : "`A`",
      "expr" : "`A`"
    }, {
      "ref" : "`B`",
      "expr" : "`B`"
    }, {
      "ref" : "`C`",
      "expr" : "`C`"
    }, {
      "ref" : "`D`",
      "expr" : "`D`"
    } ],
    "child" : 1
  }, {
    "pop" : "streaming-aggregate",
    "@id" : 3,
    "child" : 2,
    "keys" : [ ],
    "exprs" : [ {
      "ref" : "`EXPR$1`",
      "expr" : "covar_samp(`A`, `B`) "
    }, {
      "ref" : "`EXPR$2`",
      "expr" : "covar_samp(`A`, `C`) "
    }, {
      "ref" : "`EXPR$3`",
      "expr" : "covar_samp(`C`, `D`) "
    }, {
      "ref" : "`EXPR$4`",
      "expr" : "covar_pop(`A`, `B`) "
    }, {
      "ref" : "`EXPR$5`",
      "expr" : "covar_pop(`A`, `C`) "
    }, {
      "ref" : "`EXPR$6`",
      "expr" : "covar_pop(`C`, `D`) "
    }, {
      "ref" : "`EXPR$7`",
      "expr" : "corr(`A`, `B`) "
    }, {
      "ref" : "`EXPR$8`",
      "expr" : "corr(`A`, `C`) "
    }, {
      "ref" : "`EXPR$9`",
      "expr" : "corr(`C`, `D`) "
    } ]
  }, {
    "pop" : "screen",
    "@id" : 4,
    "child" : 3
  } ]
}