MarkLogic 12 EA 1 Product Documentationop.columnInfo
op.columnInfo( plan as PreparePlan ) as Array
Summary
This function can be used to inspect the state of a plan before execution. It returns the information about each column in the plan, including schema name, view name, column name, data type and nullability. It also returns the information about system columns.
| Parameters | |
|---|---|
| plan | The plan to be inspected. |
Usage Notes
Method columnInfo() cannot inspect the columns after a map() or reduce().
Example
const op = require('/MarkLogic/optic');
op.fromView('main', 'employees').columnInfo();
/* results may look like below
{"schema":"opticUnitTest", "view":"musician", "column":"lastName", "type":"string", "nullable":false}
{"schema":"opticUnitTest", "view":"musician", "column":"firstName", "type":"string", "nullable":false}
{"schema":"opticUnitTest", "view":"musician", "column":"dob", "type":"date", "nullable":false}
{"schema":"opticUnitTest", "view":"musician", "column":"rowid", "type":"rowid", "nullable":false}
{"schema":"opticUnitTest", "view":"musician", "column":"__docid", "type":"fraghint", "nullable":false}
{"schema":"opticUnitTest", "view":"musician", "column":"__content", "type":"value", "nullable":false}
*/