Fix Iceberg dereference pushdown when column has a comment

[BlueStalker]

When Query iceberg table with predicate column including comments, and deference pushdown enabled. Exception occurred if the predicates containing both nested column and non_nested, for example
select count(*) from table where col1 = 1 and col2.n1 = 3
will show exception like

Caused by: java.lang.IllegalArgumentException: Multiple entries with same key: .... 
at com.google.common.collect.ImmutableMap.conflictException(ImmutableMap.java:376) 
at com.google.common.collect.ImmutableMap.checkNoConflict(ImmutableMap.java:370) 
at com.google.common.collect.RegularImmutableMap.checkNoConflictInKeyBucket(RegularImmutableMap.java:153) 
at com.google.common.collect.RegularImmutableMap.fromEntryArray(RegularImmutableMap.java:115) 
at com.google.common.collect.ImmutableMap$Builder.buildOrThrow(ImmutableMap.java:574) 
at io.trino.plugin.iceberg.IcebergPageSourceProvider.getParquetTupleDomain(IcebergPageSourceProvider.java:834) 
at io.trino.plugin.iceberg.IcebergPageSourceProvider.createParquetPageSource(IcebergPageSourceProvider.java:646)

Also refer the testing cases.

[BlueStalker]

@alexjo2144

[alexjo2144]

Good catch, thanks!

[alexjo2144]

@findepi mind taking a look?

[findepi]

@BlueStalker @alexjo2144 the fix is quite indirect. What's the root cause of the failure?

[BlueStalker]

@BlueStalker @alexjo2144 the fix is quite indirect. What's the root cause of the failure?

The original code (applyProject), put an new Assignment with column (without comment) into ProjectionApplicationResult, and I assume later in will be available in TableScan Node, When do 'applyFilter' from PushPredicateIntoTableScan, it will contain duplicate (IcebergColumnHandle) one with comment and the other without, which will finally lead to exception of (Multiple entries with same key: .... ), also @phd3 said if applyProjection can just bypass the non nested column, it should also solve the problem.

[BlueStalker]

@findepi checked it again?

[phd3]

lgtm

[phd3]

making a couple more small changes here.

[findepi]

pushed commit title change (and renamed the PR)