sql: add max_prepared_transactions variable #129295
Draft
+68
−16
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Informs #22329.
This commit adds the max_prepared_transactions session variable, returning a value of math.MaxInt32 to indicate that there is no limit on the number of prepared transactions that can be created.
This change has the effect of unblocking the pgjdbc XADataSourceTest test suite, which was previously failing during initialization. Is also includes a small patch to work around #31632 (unsupported deferrable qualifier) so that each test in the XA test suite actually runs (and fails).
Release note: None