org.apache.drill.exec.store.easy.json.loader

Class JsonLoaderOptions

java.lang.Object

org.apache.drill.exec.store.easy.json.parser.JsonStructureOptions

org.apache.drill.exec.store.easy.json.loader.JsonLoaderOptions

public class JsonLoaderOptions
extends JsonStructureOptions

Extends the JsonStructureOptions class, which provides JSON syntactic options, with a number of semantic options enforced at the JSON loader level.

Field Summary

Fields

Modifier and Type	Field and Description
boolean	allTextMode JSON returns values as typed tokens.
boolean	classicArrayNulls Drill prior to version 1.18 would read a null string array element as the string "null".
boolean	enableExtendedTypes Enable support for Mongo-style extended types: { field: { "$type": value }, ...
TypeProtos.MinorType	nullType Type to use for a field which contains all nulls, or all empty arrays.
boolean	readNumbersAsDouble Forces all numbers to be double, even if the first number that appears is an integer.
boolean	unionEnabled
boolean	unknownsAsJson If a field contains all nulls, all empty arrays, or the first non-empty array contains a null ({@code [ null, ...

Fields inherited from class org.apache.drill.exec.store.easy.json.parser.JsonStructureOptions

allowNanInf, enableEscapeAnyChar, skipMalformedDocument, skipMalformedRecords, skipOuterList

Constructor Summary

Constructors

Constructor and Description
JsonLoaderOptions()
JsonLoaderOptions(OptionSet options)

Method Summary

Methods inherited from class java.lang.Object

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

Field Detail

allTextMode

public boolean allTextMode

JSON returns values as typed tokens. If allTextMode is set, the structure parser converts all scalars (except null) to text and forwards the values to the listener as text. Implements Drill's "all-text mode" for JSON.

readNumbersAsDouble

public boolean readNumbersAsDouble

Forces all numbers to be double, even if the first number that appears is an integer.

unionEnabled

public boolean unionEnabled

classicArrayNulls

public boolean classicArrayNulls

Drill prior to version 1.18 would read a null string array element as the string "null". Drill 1.18 and later reads the same token as a blank string. This flag forces the pre-1.18 behavior.

For {a: [null]}

• If true: --> "null"
• if false: --> ""

unknownsAsJson

public boolean unknownsAsJson

If a field contains all nulls, all empty arrays, or the first non-empty array contains a null ([ null, ... ], then the default action is to read the column as JSON: literally convert the values (of any JSON complexity) to JSON string of that structure. If false, then uses the default type.

nullType

public TypeProtos.MinorType nullType

Type to use for a field which contains all nulls, or all empty arrays. Also the default type for an array that starts with the null value, if unknownsAsJson is false.

enableExtendedTypes

public boolean enableExtendedTypes

Enable support for Mongo-style extended types:
{ field: { "$type": value }, ... }

Constructor Detail

JsonLoaderOptions

public JsonLoaderOptions()

JsonLoaderOptions

public JsonLoaderOptions(OptionSet options)