john-bodley commented on issue #4590: Removing escape_sql so we dont double 
escape
URL: 
https://github.com/apache/incubator-superset/pull/4590#issuecomment-372774659
 
 
   For context this SQLAlchemy 
[commit](https://github.com/zzzeek/sqlalchemy/commit/2392ae1900f112c44ed966783d1dedfb88f13353)
 which was included in `1.2.0` escapes percent signs (`%`) for all dialects 
where the param style is either `format` or `pyformat` per 
[this](https://github.com/zzzeek/sqlalchemy/blob/e3323df4bd781a593e90c1cb4a187ff37cc04e5a/lib/sqlalchemy/sql/compiler.py#L2999)
 which is 
[true](https://github.com/dropbox/PyHive/blob/19d7c2b8fb8b19dadeb2339d4d3f42c8f09204c1/pyhive/presto.py#L31)
 for Presto. Hence by upgrading SQLAlchemy from `1.1.9` to `1.2.2` 
([PR](https://github.com/apache/incubator-superset/pull/4299)) the percent 
signs were doubly escaped in Presto per the `PrestoEngineSpec` causing the 
regression.

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