9/1/2023 0 Comments Mysql like case insensitive![]() Maybe I'll try a quick fix for the MySQL Connector and do some kind of lowercase->actual mapping. But it baffles me why the decision was made to simply lowercase all schema/table names, thus ensuring that anything with mixed-case schema names would simply be incompatible with Presto.Īs to fixing the core issue.not sure I can/will. So I suppose a lot of the above is venting, sorry. I've also noticed at least a few tickets over the years where other connectors have had to had changes made to them in order to get around the lowercase everything method. I have a case-sensitive colume(utf8bin collation). It's very, very annoying not have a note of this behavior somewhere in the documentation so people are aware of it. Mysql Case insensitive search (and order by case insensitively) in a case-sensitive column. In fact, I wouldn't trust myself, coming at this with no experience in this code base, to do a good job in that short of a time something that's so central (the metadata information) to the entire application. ![]() Which I doubt, in that time, I can properly go through and make a proper change throughout the entire Presto code base. ![]() To match lower only or upper only cases we have to use binary command to make binary matching. As in I can take a week or two to throw together an internal application which will handle much, although certainly not all of our needs, and of course is far, far less than what Presto has but will mostly fulfill our immediate, short term needs. As we have seen all the above cases are case insensitive. So, there's no reference as to why that decision was made or what purpose it was to solve for.Īll that said, yes I can go through and do a quick job of hacking out the lowercase checks and wherever lowercasing is done in the main presto code (ignoring connectors for the moment), but I'm certain that it will have far reaching consequences for which I can't know of or even know if any of the existing tests will catch. There doesn't appear to be any tickets that it's part of, or even any reference in the release notes for the release 0.181 that it's part of ( ). This seems to be something that goes all the way back to 2012 with commit While I do appreciate that philosophy, on the other hand Dain in both of those links expressed a longstanding desire to change it to allow for mixed case metadata names. Or one of ya'll prove me wrong in the next few days and fixes this or correctly documents how to make it work. now you just need to get case insensitive name like if you search Hardik then it should get all records even if its in uppercase, lowercase or capitalize. I'm very, very sad about this, and seriously hope that one day in the future this will be fixed. I needed to create a query that did a case insensitive search using the LIKE command in MySQL and I quickly realised that in order to do this I would need. ![]() So as of this time, much to my disappointment, I have to say Presto fails to meet almost any of our needs even though on paper it looks like it most definitely should (especially the cross-connector JOINs). MySQL case-sensitive LIKE search less than 1 minute read When searching for partial strings in MySQL with LIKEyou will match case-insensitive by default. Unless there's other discussions elsewhere that I haven't found. While you should always uphold the case-sensitive tablenames, it can be troublesome when migrating from a host that had this option enabled (table & column. yet even after 2 years there seems to be absolutely NO motivation or effort, or even really caring whatsoever about this issue. This tutorial article will show you how to use the LIKE operator to search a column. I've found a few references such as !topic/presto-users/2tN7HWUb0LI/discussion and bringing up the issue. ![]() We have a few different MySQL instances/DBs that we want to use in conjunction with Hive via Presto, however we have been running lower_case_table_names=0 (see ), and Hibernate of course created the tables with camel-case names. While you can use a scalar function such as UPPER or LOWER and you can re-collate the column so that it's no longer case sensitive, these approaches all require data conversion be done against the base data which will never allow for an index seek.I'm new to Presto and evaluating it's usefulness to us, but I'm running into a huge problem. Is it possible to search within a MySQL JSON array in a case insensitive manner Asked 6 years, 5 months ago Modified 2 years, 10 months ago Viewed 8k times 2 e.g. ![]()
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