{
  head : {
    version : 1,
    generator : {
      type : "optiq",
      info : "na"
    },
    type : "APACHE_DRILL_PHYSICAL"
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         {
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             url: "http://apache.org",
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                   {name: "blue", type: "BIGINT", mode: "REQUIRED"}
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    exprs : [
    { ref : "CBRTVAL", expr : " cbrt(1000) "},
    { ref : "LOGVAL", expr : " log(10) "},
    { ref : "LOG10VAL", expr : " log10(5) "},
    { ref : "LOGVALBASE", expr : " log(2.0, 64.0) "},
    { ref : "EXP", expr : " exp(10) "},
    { ref : "DEGREES", expr : " degrees(0.5) "},
    { ref : "RADIANS", expr : " radians(45.0) "},
    { ref : "PIVAL", expr : " pi() " },
    { ref : "CBRTVAL", expr : " cbrt(100111111111111111111111111111111111.00000000000000000000000000000000000000000000000000001) "},
    { ref : "LOGVAL", expr : " log(100111111111111111111111111111111111.00000000000000000000000000000000000000000000000000001) "},
    { ref : "LOGVALBASE", expr : " log(2, 100111111111111111111111111111111111.00000000000000000000000000000000000000000000000000001) "},
    { ref : "EXP", expr : " exp(100111111111111111111111111111111111.00000000000000000000000000000000000000000000000000001) "},
    { ref : "DEGREES", expr : " degrees(100111111111111111111111111111111111.00000000000000000000000000000000000000000000000000001) "},
    { ref : "RADIANS", expr : " radians(100111111111111111111111111111111111.00000000000000000000000000000000000000000000000000001) "}
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}