[ARROW-1943] Handle setInitialCapacity() for deeply nested lists of lists

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.9.0
• Component/s: Java
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/17933
• Assignee: Siddharth Teotia
• Reporter: Siddharth Teotia
• Created: 21/Dec/17 00:43
• Updated: 11/Jan/23 07:17
• Resolved: 22/Dec/17 19:25

Description

The current implementation of setInitialCapacity() uses a factor of 5 for every level we go into list:

So if the schema is LIST (LIST (LIST (LIST (LIST (LIST (LIST (BIGINT)))))) and we start with an initial capacity of 128, we end up throwing OversizedAllocationException from the BigIntVector because at every level we increased the capacity by 5 and by the time we reached inner scalar that actually stores the data, we were well over max size limit per vector (1MB).

We saw this problem in Dremio when we failed to read deeply nested JSON data.

Issue Links

• links to: GitHub Pull Request #1439