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

Class FragmentLeaf

java.lang.Object

io.trino.operator.table.json.execution.FragmentLeaf

All Implemented Interfaces:

JsonTableProcessingFragment

public class FragmentLeaf
extends Object
implements JsonTableProcessingFragment

Constructor Summary

Constructors

Constructor	Description
FragmentLeaf(IrJsonPath path, List<Column> columns, boolean errorOnError, 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()	Tries to produce output values for all columns included in the Fragment, and stores them in 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)	FragmentLeaf 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

FragmentLeaf

public FragmentLeaf(IrJsonPath path,
 List<Column> columns,
 boolean errorOnError,
 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)

FragmentLeaf 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()

Description copied from interface: JsonTableProcessingFragment

Tries to produce output values for all columns included in the Fragment, and stores them in corresponding positions in `newRow`. Note: According to OUTER or UNION semantics, some values might be null-padded instead of computed. Note: a single JSON item might result in multiple output rows. To fully process a JSON item, the caller must: - reset the Fragment with the JSON item - call getRow() and collect output rows as long as `true` is returned If `false` is returned, there is no output row available, and the JSON item is fully processed

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