[Bug fix] Divide by 1000.000 in epoch_ms_to_dttm() to not lose precis…

…ion in Presto (apache#5211)

* Fix how the annotation layer interpretes the timestamp string without timezone info; use it as UTC

* [Bug fix] Fixed/Refactored annotation layer code so that non-timeseries annotations are applied based on the updated chart object after adding all data

* [Bug fix] Fixed/Refactored annotation layer code so that non-timeseries annotations are applied based on the updated chart object after adding all data

* Fixed indentation

* Fix the key string value in case series.key is a string

* Fix the key string value in case series.key is a string

* [Bug fix] Divide by 1000.000 in epoch_ms_to_dttm() to not lose precision in Presto

* [Bug fix] Divide by 1000.000 in epoch_ms_to_dttm() to not lose precision in Presto

superset/db_engine_specs.py

@@ -84,7 +84,7 @@ def epoch_to_dttm(cls):
 
     @classmethod
     def epoch_ms_to_dttm(cls):
-        return cls.epoch_to_dttm().replace('{col}', '({col}/1000.0)')
+        return cls.epoch_to_dttm().replace('{col}', '({col}/1000.000)')
 
     @classmethod
     def get_datatype(cls, type_code):