Norman Jordan created CALCITE-6392:
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             Summary: Support all PostgreSQL 14 date/time patterns for 
to_date/to_timestamp
                 Key: CALCITE-6392
                 URL: https://issues.apache.org/jira/browse/CALCITE-6392
             Project: Calcite
          Issue Type: Sub-task
            Reporter: Norman Jordan
            Assignee: Norman Jordan


Many of the date/time format patterns supported by PostgreSQL 14 are not 
supported in Calcite.
 * HH
 * US
 * SSSS
 * SSSSS
 * AM
 * A.M.
 * am
 * a.m.
 * PM
 * P.M.
 * pm
 * p.m.
 * Y,YYY
 * YYY
 * Y
 * IYYY
 * IYY
 * IY
 * I
 * BC
 * B.C.
 * bc
 * b.c.
 * AD
 * A.D.
 * ad
 * a.d.
 * MONTH
 * month
 * MON
 * mon
 * DAY
 * day
 * Dy
 * dy
 * IDDD
 * ID
 * TZH
 * TZM
 * OF

There are also template pattern modifiers that need to be supported.
 * FM (prefix)
 * TH (suffix)
 * th (suffix)
 * FX (prefix)
 * TM (prefix)

Some format patterns in Calcite behave differently from PostgreSQL 14.
 * FF1
 * FF2
 * FF4
 * FF5
 * FF6

Also verify that the other existing format strings produce results that match 
PostgreSQL 14.



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