wnob commented on code in PR #205:
URL: https://github.com/apache/calcite-avatica/pull/205#discussion_r1081880447
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core/src/main/java/org/apache/calcite/avatica/AvaticaResultSet.java:
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@@ -77,7 +78,9 @@ public AvaticaResultSet(AvaticaStatement statement,
ResultSetMetaData resultSetMetaData,
TimeZone timeZone,
Meta.Frame firstFrame) throws SQLException {
- super(timeZone);
+ // Initialize the parent ArrayFactory with the UTC time zone because
otherwise an array of
Review Comment:
I can't refute that with 100% certainty, but I will point out:
- Currently, at head, if you just make this 1 line change to pass
`UTC_CALENDAR` to the super constructor (here, the superclass being
`ArrayFactoryImpl`) and run all the tests, none of them fail.
- Alternatively, if you keep this 1 line as is, but go into
`AvaticaResultSetConversionTest` and delete the [`timeZone` property for the
connection][1], which is currently set to `"GMT"`, several `getString()` and
`getArray()` tests start to fail. The `getString()` failures are
self-explanatory, but the `getArray()` failures are tricky. They're
double-adjusting the timestamps:
- Once when they call [`getObject()`][2] (which invokes `getTimestamp()`
with the connection's default calendar, which was previously GMT but is now the
system default).
- Then, in [`ArrayImpl.equalContents()`][3] the arrays are converted to
result sets for traversal via [`Array.getResultSet()` ][4], which uses the same
time zone as the "factory" result set and eventually invokes `getObject()`
again, thus applying the time zone offset twice.
So, there's certainly an existing bug in the implementation of
`Array.getResultSet()` that only manifests when the array contains timestamps
and when the connection default time zone is not GMT, and this was not covered
by tests. By removing the explicit GMT `timeZone` for these tests, I'm covering
this case, and this seemed like the best solution. It's just hardcoding a UTC
time zone for `ArrayFactoryImpl` parent of a `ResultSet`.
[1]:
https://github.com/apache/calcite-avatica/blob/dbe9b1d8c2e53474eb40cfaf5721aceca3bdb57f/core/src/test/java/org/apache/calcite/avatica/AvaticaResultSetConversionsTest.java#L1121
[2]:
https://github.com/apache/calcite-avatica/blob/810acf80771310431d7ef576f3404299ebb8eaf2/core/src/main/java/org/apache/calcite/avatica/util/AbstractCursor.java#L1432
[3]:
https://github.com/apache/calcite-avatica/blob/820edf6f653607afb5a2a280a32f315aff1f64cb/core/src/main/java/org/apache/calcite/avatica/util/ArrayImpl.java#L233
[4]:
https://docs.oracle.com/javase/8/docs/api/java/sql/Array.html#getResultSet--
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