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

Class FragmentSingle

java.lang.Object

io.trino.operator.table.json.execution.FragmentSingle

All Implemented Interfaces:

JsonTableProcessingFragment

public class FragmentSingle
extends Object
implements JsonTableProcessingFragment

Constructor Summary

Constructors

Constructor	Description
FragmentSingle(IrJsonPath path, List<Column> columns, boolean errorOnError, boolean outer, JsonTableProcessingFragment child, Object[] newRow, ConnectorSession session, Metadata metadata, TypeManager typeManager, FunctionManager functionManager)

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()	All values produced by the columns are stored on corresponding positions in `newRow`.
void	reset(com.fasterxml.jackson.databind.JsonNode item, Page input, int position)	Prepares the Fragment to produce rows for the new JSON item.
void	resetRoot(com.fasterxml.jackson.databind.JsonNode item, Page input, int position, Object[] pathParameters)	FragmentSingle can be the root Fragment.

Methods inherited from class java.lang.Object

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

Constructor Details

FragmentSingle

public FragmentSingle(IrJsonPath path,
 List<Column> columns,
 boolean errorOnError,
 boolean outer,
 JsonTableProcessingFragment child,
 Object[] newRow,
 ConnectorSession session,
 Metadata metadata,
 TypeManager typeManager,
 FunctionManager functionManager)

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

resetRoot

public void resetRoot(com.fasterxml.jackson.databind.JsonNode item,
 Page input,
 int position,
 Object[] pathParameters)

FragmentSingle can be the root Fragment. The root fragment is the only fragment that may have path parameters. Prepares the root Fragment to produce rows for the new JSON item and a set of path parameters.

Specified by:

resetRoot 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

pathParameters - JSON path parameters for the top-level JSON path

getRow

public boolean getRow()

All values produced by the columns are stored on corresponding positions in `newRow`. The values in `newRow` are not cleared between subsequent calls to `getRow()`, so the values for columns are automatically reused during iterating over child.

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