Package io.trino.operator.table.json.execution

Class FragmentUnion

java.lang.Object

io.trino.operator.table.json.execution.FragmentUnion

All Implemented Interfaces:

JsonTableProcessingFragment

public class FragmentUnion
extends Object
implements JsonTableProcessingFragment

Constructor Summary

Constructors

Constructor	Description
FragmentUnion(List<JsonTableProcessingFragment> siblings, Object[] newRow)

Method Summary

Modifier and Type	Method	Description
int[]	getOutputLayout()	Returns an array containing indexes of columns produced by the fragment within all columns produced by json_table.
boolean	getRow()	The values produced by the current sibling are stored on corresponding positions in `newRow`, and for other siblings `newRow` is filled with nulls.
void	reset(com.fasterxml.jackson.databind.JsonNode item, Page input, int position)	Prepares the Fragment to produce rows for the new JSON item.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface io.trino.operator.table.json.execution.JsonTableProcessingFragment

resetRoot

Constructor Details

FragmentUnion

public FragmentUnion(List<JsonTableProcessingFragment> siblings,
 Object[] newRow)

Method Details

reset

public void reset(com.fasterxml.jackson.databind.JsonNode item,
 Page input,
 int position)

Description copied from interface: JsonTableProcessingFragment

Prepares the Fragment to produce rows for the new JSON item. Note: This method must be called for each new JSON item. Due to nesting, there might be multiple JSON items to process for a single position in the input page. Therefore, input and position may not change for subsequent calls.

Specified by:

reset in interface JsonTableProcessingFragment

Parameters:

item - the new JSON item

input - the input Page currently processed by json_table function

position - the currently processed position in the input page

getRow

public boolean getRow()

The values produced by the current sibling are stored on corresponding positions in `newRow`, and for other siblings `newRow` is filled with nulls. The values in `newRow` are not cleared between subsequent calls to getRow(), so that the parts which do not change are automatically reused.

Specified by:

getRow in interface JsonTableProcessingFragment

Returns:

true if row was produced, false if row was not produced (Fragment is finished)

getOutputLayout

public int[] getOutputLayout()

Description copied from interface: JsonTableProcessingFragment

Returns an array containing indexes of columns produced by the fragment within all columns produced by json_table.

Specified by:

getOutputLayout in interface JsonTableProcessingFragment