Parquet preview fails in 1.43.0 with missing option: typeLength (required for FIXED_LEN_BYTE_ARRAY) (worked in 1.41.1)

Storage Explorer Version

1.43.0

Regression From

1.41.1

Architecture

x64

Storage Explorer Build Number

20260407.6

Platform

Windows

OS Version

Windows 11

Bug Description

After upgrading Azure Storage Explorer from 1.41.1 to 1.43.0, Parquet files that previously opened successfully in the built‑in preview now fail with the following error:
Error: missing option: typeLength (required for FIXED_LEN_BYTE_ARRAY)

This prevents viewing the file contents entirely.

Resource Types

Blobs

Authentication Method

Sign in

Connection Type

Sign in (subscription)

Steps to Reproduce

To Reproduce
Steps to reproduce the behaviour:

Install Azure Storage Explorer 1.43.0
Navigate to a container/directory containing Parquet files
Open a Parquet file (that was previously viewable in 1.41.1)
Observe the error in the preview pane

Actual Experience

{
"name": "Error",
"message": "missing option: typeLength (required for FIXED_LEN_BYTE_ARRAY)",
"stack": "Error: missing option: typeLength (required for FIXED_LEN_BYTE_ARRAY)
at decodeValues_FIXED_LEN_BYTE_ARRAY (C:\Program Files\Microsoft Azure Storage Explorer\resources\app\node_modules\@storage-explorer\file-preview\dist\src\index.js:31:29012)
at Object.decodeValues (C:\Program Files\Microsoft Azure Storage Explorer\resources\app\node_modules\@storage-explorer\file-preview\dist\src\index.js:31:29860)
at decodeValues (C:\Program Files\Microsoft Azure Storage Explorer\resources\app\node_modules\@storage-explorer\file-preview\dist\src\index.js:90:119015)
at decodeDictionaryPage (C:\Program Files\Microsoft Azure Storage Explorer\resources\app\node_modules\@storage-explorer\file-preview\dist\src\index.js:90:121097)
at process.processTicksAndRejections (node:internal/process/task_queues:103:5)
at async decodePage (C:\Program Files\Microsoft Azure Storage Explorer\resources\app\node_modules\@storage-explorer\file-preview\dist\src\index.js:90:120057)
at async ...
}

Expected Experience

Parquet files should preview successfully, as they did in version 1.41.1, without requiring changes to existing files.

Additional Context

AI Says

Possible cause
It appears the Parquet reader used in 1.43.0 has stricter handling for FIXED_LEN_BYTE_ARRAY types and now requires typeLength metadata to be present.

The files in question:

Contain FIXED_LEN_BYTE_ARRAY columns (likely decimals or fixed binary values)
Were readable in earlier versions, suggesting a regression or stricter validation in the newer preview component (@storage-explorer/file-preview)

The files are still readable using other tools (e.g., PyArrow, Spark, parquet-tools), suggesting the files are valid or at least widely compatible.
Downgrading to 1.41.1 restores functionality.
This impacts usability when inspecting existing datasets without reprocessing them.

I can pass an example file privately , however I can't upload it publicly for all to see

Start with the @storage-explorer/file-preview component and the decodeValues_FIXED_LEN_BYTE_ARRAY and decodeDictionaryPage entries shown in the stack trace. Compare the Parquet preview behavior between versions 1.43.0 and 1.41.1, using a representative file with FIXED_LEN_BYTE_ARRAY columns if available. Done means existing Parquet files preview successfully without the missing typeLength error.