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Generated columns

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This is an SQL-standard feature that allows creating columns that are
computed from expressions rather than assigned, similar to a view or
materialized view but on a column basis.

This implements one kind of generated column: stored (computed on
write).  Another kind, virtual (computed on read), is planned for the
future, and some room is left for it.

Reviewed-by: Michael Paquier <michael@paquier.xyz>
Reviewed-by: Pavel Stehule <pavel.stehule@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/b151f851-4019-bdb1-699e-ebab07d2f40a@2ndquadrant.com
This commit is contained in:
Peter Eisentraut
2019-03-30 08:13:09 +01:00
parent 6b8b5364dd
commit fc22b6623b
84 changed files with 3067 additions and 157 deletions
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doc/src/sgml/ref/copy.sgml
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@@ -103,7 +103,8 @@ COPY { <replaceable class="parameter">table_name</replaceable> [ ( <replaceable
<listitem>
<para>
An optional list of columns to be copied. If no column list is
specified, all columns of the table will be copied.
specified, all columns of the table except generated columns will be
copied.
</para>
</listitem>
</varlistentry>