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| head:{ |
| type:"APACHE_DRILL_PHYSICAL", |
| version:"1", |
| generator:{ |
| type:"manual" |
| } |
| }, |
| graph: [ |
| { |
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| pop:"mock-sub-scan", |
| url: "http://apache.org", |
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| exprs:[ { ref : "`**`", expr : "`**`"} ] |
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| pop:"screen" |
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