Werner Daehn created PARQUET-1620:
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Summary: Schema creation from another schema will not be possible
- deprecated
Key: PARQUET-1620
URL: https://issues.apache.org/jira/browse/PARQUET-1620
Project: Parquet
Issue Type: Bug
Components: parquet-mr
Affects Versions: 1.11.0
Reporter: Werner Daehn
Imagine I have a current schema and want to create a projection schema from
that. One option is the schema.Types.*Builder but the more direct version would
be to clone the schema itself without children.
{{List<org.apache.parquet.schema.Type> l = new ArrayList<>();}}
{{ for (String c : childmappings.keySet()) {}}
{{ Mapping m = childmappings.get(c);}}
{{ l.add(m.getProjectionSchema());}}
{{ }}}
{{ GroupType gt = new GroupType(schema.getRepetition(), schema.getName(),
schema.getOriginalType(), l);}}
The last line, the new GroupType(..) constructor is deprecated. We should use
the version with the LogicalTypeAnnotation instead. Fine. But how do you get
the LogicalTypeAnnotation from an existing schema?
I feel you should not deprecate these methods and if, provide an extra method
to create a Type column from a type column (column alone, without children.
Else the projection would have all child columns).
Do you agree?
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