[
https://issues.apache.org/jira/browse/ARROW-18208?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
ASF GitHub Bot updated ARROW-18208:
-----------------------------------
Labels: pull-request-available (was: )
> JS: tableFromJSON cannot handle nested objects containing strings
> -----------------------------------------------------------------
>
> Key: ARROW-18208
> URL: https://issues.apache.org/jira/browse/ARROW-18208
> Project: Apache Arrow
> Issue Type: Bug
> Reporter: Samuel Schneck
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> ```
> $ node
> const g = require('apache-arrow')
> g.tableFromJSON([\{a: [ { b: "hi" } ]}])
> ```
>
> The dictionary types:
>
> TYPE Dictionary \{indices: Int32, dictionary: Utf8, isOrdered: false, id:
> 12}dictionary: Utf8 {}id: 12indices: Int32 \{isSigned: true, bitWidth:
> 32}isOrdered: falseArrayType: (...)children: (...)typeId: (...)valueType:
> (...)[[Prototype]]: Dictionary
> typecomparator.ts:191 OTHER
>
> OTHER Dictionary \{indices: Int32, dictionary: Utf8, isOrdered: false, id:
> 14}dictionary: Utf8typeId: (...)[[Prototype]]: Utf8id: 14indices: Int32
> \{isSigned: true, bitWidth: 32}isOrdered: falseArrayType: (...)children:
> (...)typeId: (...)valueType: (...)[[Prototype]]: Dictionary
>
> This happens here:
> else if (arraysCount + nullsCount === value.length) {
> const array = value;
> const childType = inferType(array[array.findIndex((ary) => ary !=
> null)]);
> if (array.every((ary) => ary == null || (0,
> typecomparator_js_1.compareTypes)(childType, inferType(ary)))) {
> return new dtypes.List(new schema_js_1.Field('', childType,
> true));
> }
> }
>
> So we're always instantiating a new dictionary type, with a new id, when we
> do inferType(ary), so this is never going to succeed.
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
