topic Internal Error when querying a doubleType column of a delta table using ">" "<" operators in Data Engineering

Internal Error when querying a doubleType column of a delta table using ">" "<" operators

Christoph — Mon, 05 Feb 2024 15:56:50 GMT

Hi there,

we are currently facing a pretty confusing issue:

We have a delta table (~2TB) which has been working just fine over the last few years and months. For a few days or weeks now, querying the table on one of its columns, let´s call it double_column, from datatype DoubleType, using ">" "<" operators, results in an error.

So a query like...

SELECT * FROM example_table WHERE double_column > 1

... would throw an error, whereas using "==" or "!="... works just fine.

The following error is thrown:

AssertionError: assertion failed

org.apache.spark.SparkException: [INTERNAL_ERROR] The Spark SQL phase planning failed with an internal error. You hit a bug in Spark or the Spark plugins you use. Please, report this bug to the corresponding communities or vendors, and provide the full stack trace.

However, querying an older version of the table works just fine:

SELECT * FROM example_table VERSION AS OF 100 WHERE double_column > 1

...returns the desired result.

What´s even more confusing, when we query the latest version of the table using...

SELECT * FROM example_table VERSION AS OF 500 [this is the latest version] WHERE double_column > 1

...it works as well, even though it should query the same state of the table as the first query, right?

Would be nice if anyone has some suggestions on how to fix this 🙂

kind regards
Christoph

Re: Internal Error when querying a doubleType column of a delta table using ">" "&

-werners- — Tue, 06 Feb 2024 12:46:13 GMT

Nice 🙂
Do you happen to use a Photon cluster? If so, can you run a test without Photon?

Re: Internal Error when querying a doubleType column of a delta table using ">" "&

Christoph — Tue, 06 Feb 2024 13:13:44 GMT

No, Photon was not activated on any of the clusters I tried running the queries on.

The easiest solution for this problem is casting the column double_column to FloatType. Then it works as expected again, I coudn´t figure out why though. So this will be our short term fix, but still we would like to understand this issue 😄

Re: Internal Error when querying a doubleType column of a delta table using ">" "&

-werners- — Tue, 06 Feb 2024 13:22:45 GMT

it might be a bug which is already logged, or a new one. You can check the Spark Jira pages.