rapidsai/cudf

[BUG] Loading a missing column from a Parquet file results in ArrayIndexOutOfBoundsException

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#11,278 opened on Jul 15, 2022

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JavaPythonSparkbuggood first issue

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Description

Describe the bug Attempting to load a non-existent column from a Parquet file throws ArrayIndexOutOfBoundsException instead of a more specific error.

Steps/Code to reproduce bug Try to load a single column name that does not exist from a Parquet file. For example:

Table.readParquet(ParquetOptions.builder().includeColumn("doesnotexist").build(), new java.io.File("data.parquet"))

throws the following exception:

java.lang.ArrayIndexOutOfBoundsException: 0
  at ai.rapids.cudf.Table.<init>(Table.java:96)
  at ai.rapids.cudf.Table.readParquet(Table.java:974)
  ... 49 elided

Expected behavior A more useful error exception/message should be used than an array index error.

Contributor guide

Research direction
Inspect the Parquet reading code path in cudf Java bindings to locate where the column index is accessed without checking for null or out of bounds, then add a validation to throw a descriptive error.
Tech stack
java
Domain
databackend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
JavacuDF library
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50