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https://issues.apache.org/jira/browse/IMPALA-2210?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zoltán Borók-Nagy updated IMPALA-2210:
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Target Version: Impala 5.0.0 (was: Impala 4.3.0)
> Make Parquet the default file format
> ------------------------------------
>
> Key: IMPALA-2210
> URL: https://issues.apache.org/jira/browse/IMPALA-2210
> Project: IMPALA
> Issue Type: Improvement
> Components: Frontend
> Affects Versions: Impala 2.2.4
> Reporter: John Russell
> Priority: Blocker
> Labels: incompatibility, newbie, usability
>
> I expect that by far the most common use case for CREATE TABLE LIKE PARQUET
> is to make a table where the specified Parquet file will be queried. That
> is, either:
> CREATE TABLE foo LIKE PARQUET '/blah/blah/file.parq' STORED AS PARQUET;
> LOAD DATA INFILE '/blah/blah/file.parq' INTO TABLE foo;
> or
> CREATE EXTERNAL TABLE foo LIKE PARQUET '/blah/blah/file.parq' STORED AS
> PARQUET LOCATION '/blah/blah';
> I have difficulty imagining a case where someone would do CREATE TABLE LIKE
> PARQUET and want the result to be a text table. Even if someone planned to
> convert Parquet -> text, they would need to have a Parquet table to begin
> with, in which case they would do CREATE TABLE text_table LIKE parquet_table,
> not CREATE TABLE LIKE PARQUET.
> It is easy to leave off the STORED AS PARQUET clause by mistake from a CTLP
> statement, because PARQUET already occurs earlier in the statement, resulting
> in a text table that throws conversion errors when queried. How about making
> Parquet the default format in this case, and requiring the STORED AS clause
> only to use a different file format? (Then if Impala implemented a CREATE
> TABLE LIKE AVRO syntax, the default in that case would be Avro.)
> Since I guess this would qualify as an incompatible change, we would need to
> think through the appropriate release vehicle.
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