Opt-in to handle errors caused by long comments on tables #9
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chelsea76
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satishaher
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Jun 27, 2024
zokioki
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… comments This change fixes an issue with the `tables` call erroring out if attempting to fetch any tables that have longer than 254 character comments on them. This fix is based on the approach used by the patterninc fork of the gem, whose PR does a great job of explaining the issue and idea behind the solution: > The fetch_all function is using a bound 'remarks' column that is configured to > have a max_length of 254 characters. That max length is not configurable and the > column cannot be unbound. So when a table with a comment longer than 254 characters > exists in the result set, we run into the negative string size (or size too big) error. - patterninc#9 The primary difference here is that we're using `SHOW TABLES IN ACCOUNT` query, which should return the same set of tables as `fetch_all` was returning before, eliminating the need for an opt-in config flag. Snowflake docs on the SHOW TABLES query: https://docs.snowflake.com/en/sql-reference/sql/show-tables
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Allow clients to opt-in to handling long-comment tables by using a
SHOW TABLESquery. Thefetch_allfunction is using a bound 'remarks' column that is configured to have a max_length of 254 characters. That max length is not configurable and the column cannot be unbound. So when a table with a comment longer than 254 characters exists in the result set, we run into thenegative string size (or size too big)error.This change uses a
show tablesquery which generates a comment column definition with the max length allowed in snowflake. This allows us to pull down tables with any size comment. Since the result set is different between theshow tablesquery and thefetch_allfunction on the tables ODBC:Statement object, the application must opt-in to using this functionality by definingsilo_fetch_all_tablesin the database.yml file (see below).