+Revised executor state representation; plan trees are read-only to executor now
Information schema
Domains now support CHECK constraints
+psql backslash commands for listing conversions, casts, and schemas
+TRUNCATE TABLE is transaction-safe
+Statement-level triggers
+System can use either hash- or sort-based strategy for grouped aggregation
+ON COMMIT options for temp tables
+extra_float_digits option allows pg_dump to dump float data accurately
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