PrestoDB (Trino) SQL Error - ORC ACID file should have 6 columns, found Y

We faced this error while querying Hive Table using Trino -

Error -

SQL Error [16777223]: Query failed (#20230505_155701_00194_n2vdp): ORC ACID file should have 6 columns, found 17

This was happening because Table being queried was Hive Managed Internal Table, which by default in CDP ( Cloudera ) distribution is ACID compliant.

Now, in order for a Hive Table to be ACID complaint -

The underlying file system should be ORC,
and there were a few a changes on ORC file structure like the root column should be a struct with 6 nested columns (which encloses the data and the type of operation). Something like below

struct< operation: int, originalTransaction: bigInt, bucket: int, rowId: bigInt, currentTransaction: bigInt, row: struct<...> >

For more ORC ACID related internals - please take a look here

https://orc.apache.org/docs/acid.html

Now, problem in our case was that though Hive Table was declared Internal but ORC Files present were not having header column containing required 6 fields to be ACID compliant. Hence, SQL was failing from Trino.

Solution-

So, we created another Hive External Table on same HDFS location as Hive Internal Table and started executing SQL's on same.

Comments

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