villebro commented on a change in pull request #8150: add-hana
URL:
https://github.com/apache/incubator-superset/pull/8150#discussion_r319710756
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File path: superset/db_engine_specs/hana.py
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@@ -0,0 +1,59 @@
+from superset.db_engine_specs.base import LimitMethod
+from superset.db_engine_specs.postgres import PostgresBaseEngineSpec
+
+
+class HanaPyhdbEngineSpec(PostgresBaseEngineSpec):
+ engine = "hana+pyhdb"
+ limit_method = LimitMethod.WRAP_SQL
+ force_column_alias_quotes = True
+ max_column_name_length = 30
+ time_grain_functions = {
+ None: '{col}',
+ 'P1D': "TO_DATE({col})",
+ 'P1M': "SUBSTRING(to_date({col}),0,7)||'-01'",
+ 'P0.25Y':
"SUBSTRING(to_date({col}),0,5)||'0'||SUBSTRING(QUARTER(TO_DATE({col}),
1),7,1)||'-01'",
+ 'P1Y': "YEAR({col})||'-01-01'",
Review comment:
It seems `P1D` returns a `DATE` type while the others return some form of
`STRING`. I believe these should all be cast to a `DATE`/`DATETIME` type or
similar. Furthermore, would you be able to provide definitions for other time
grains, like week, minute and second?
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