Description

When I create a table using the iceberg connector and set the table's location to a bucket (without a subfolder), Trino throws a metadata location mismatch error (see below).

Setup

Trino with the Iceberg connector using Minio as storage layer. Hive standalone metadata server using Postgres backend.

Error

SQL Error [65536]: Query failed (#20221010_171704_00057_2juwr): Metadata location [s3a://datalake/metadata/00000-17fce192-87bb-4d14-8627-3508fbf1e4fd.metadata.json] is not same as table metadata location [s3a://datalake//metadata/00000-17fce192-87bb-4d14-8627-3508fbf1e4fd.metadata.json] for billtest.test1

It appears that the only difference between the two paths is an extra forward slash character before 'metadata'.
s3a://datalake/metadata
vs
s3a://datalake//metadata

Steps to recreate

Step 1: Create table using iceberg connector

CREATE TABLE iceberg.billtest.test1
(
    id BIGINT,
    name VARCHAR
)
WITH (
     format = 'PARQUET',
     location = 's3a://datalake/'
)

Step 2: alter table to add new column

ALTER TABLE iceberg.billtest.test1 ADD COLUMN IF NOT EXISTS score DOUBLE

After step two, the above error is returned.

Workaround

The workaround is when creating the table, use a folder underneath the bucket, like this:

CREATE TABLE iceberg.billtest.test1
(
    id BIGINT,
    name VARCHAR
)
WITH (
     format = 'PARQUET',
     location = 's3a://datalake/test1'
)