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Implement ALTER TABLE ... SPLIT PARTITION ... command

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This new DDL command splits a single partition into several parititions.
Just like ALTER TABLE ... MERGE PARTITIONS ... command, new patitions are
created using createPartitionTable() function with parent partition as the
template.

This commit comprises quite naive implementation which works in single process
and holds the ACCESS EXCLUSIVE LOCK on the parent table during all the
operations including the tuple routing.  This is why this new DDL command
can't be recommended for large partitioned tables under a high load.  However,
this implementation come in handy in certain cases even as is.
Also, it could be used as a foundation for future implementations with lesser
locking and possibly parallel.

Discussion: https://postgr.es/m/c73a1746-0cd0-6bdd-6b23-3ae0b7c0c582%40postgrespro.ru
Author: Dmitry Koval
Reviewed-by: Matthias van de Meent, Laurenz Albe, Zhihong Yu, Justin Pryzby
Reviewed-by: Alvaro Herrera, Robert Haas, Stephane Tachoires
This commit is contained in:
Alexander Korotkov
2024-04-07 00:58:09 +03:00
parent 1adf16b8fb
commit 87c21bb941
19 changed files with 3766 additions and 14 deletions
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18
src/backend/utils/adt/ruleutils.c
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@ -13241,3 +13241,21 @@ get_range_partbound_string(List *bound_datums)
return buf->data;
}
/*
* get_list_partvalue_string
* A C string representation of one list partition value
*/
char *
get_list_partvalue_string(Const *val)
{
deparse_context context;
StringInfo buf = makeStringInfo();
memset(&context, 0, sizeof(deparse_context));
context.buf = buf;
get_const_expr(val, &context, -1);
return buf->data;
}