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Support globbing for multiple parquet files? #24

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marklit opened this Issue Jun 25, 2018 · 1 comment

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@marklit

marklit commented Jun 25, 2018

Is there a way I can load multiple parquet files?

My first guess brings back the following IOError from Arrow:

CREATE VIRTUAL TABLE trips USING parquet('parquet/*');
Error: Arrow error: IOError: Failed to open local file: parquet/* , error: No such file or directory

For the record there are two parquet files in that folder.

$ ls -l parquet/00000*
-rw-rw-r-- 1 mark mark 2079571240 Jun 25 05:58 parquet/000000_0
-rw-rw-r-- 1 mark mark 2053401839 Jun 25 06:07 parquet/000001_0
@cldellow

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cldellow commented Jun 25, 2018

I'd like to support this more seamlessly in the future, either by supporting a glob or, like Hive, taking a directory to query. There are some internal design things I'd have to think about first, though.

Until then, the best I can suggest is to create N tables, one per parquet file, then create a view that UNION ALLs the tables. If you invoke sqlite like sqlite3 mydb.db, it will persist the view so that future invocations of sqlite don't need to recreate it.

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