Paul Rogers created DRILL-7006:
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Summary: Support type conversion shims in RowSetWriter
Key: DRILL-7006
URL: https://issues.apache.org/jira/browse/DRILL-7006
Project: Apache Drill
Issue Type: Improvement
Affects Versions: 1.15.0
Reporter: Paul Rogers
Assignee: Paul Rogers
Fix For: 1.16.0
The {{RowSet}} tools include a {{RowSetWriter}} for populating a batch of
vectors. A set of "column writers" exist: one for each kind of vector. These
classes provide methods to write a value into a vector. For example, the
{{VarcharColumnWriter}} provides a {{setString())}} method to set the value.
The current writers provide only "natural" conversions: from Java String to
Varchar, from Java Double to FLOAT8 and so on. That is, the methods implemented
for each type are those that provide s single, unambiguous conversion.
This ticket asks to add a translation layer: to allow, say, writing an Int
column using a String (parsed according to some rules). Or, to convert from a
string to a Date using some format.
The goal is not to provide the type conversions themselves, rather it is to
provide a way to insert the type conversion "shim" on top of the "native"
column writer in a way that is transparent to code using the row set writer.
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