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Allow "COPY table TO" command to copy rows from materialized views.

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Previously, "COPY table TO" command worked only with plain tables and
did not support materialized views, even when they were populated and
had physical storage. To copy rows from materialized views,
"COPY (query) TO" command had to be used, instead.

This commit extends "COPY table TO" to support populated materialized
views directly, improving usability and performance, as "COPY table TO"
is generally faster than "COPY (query) TO". Note that copying from
unpopulated materialized views will still result in an error.

Author: jian he <jian.universality@gmail.com>
Reviewed-by: Kirill Reshke <reshkekirill@gmail.com>
Reviewed-by: David G. Johnston <david.g.johnston@gmail.com>
Reviewed-by: Vignesh C <vignesh21@gmail.com>
Reviewed-by: Fujii Masao <masao.fujii@gmail.com>
Discussion: https://postgr.es/m/CACJufxHVxnyRYy67hiPePNCPwVBMzhTQ6FaL9_Te5On9udG=yg@mail.gmail.com
This commit is contained in:
Fujii Masao
2025-04-04 19:32:00 +09:00
parent 9ef1851685
commit 534874fac0
4 changed files with 39 additions and 15 deletions
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13
src/backend/commands/copyto.c
View File

@@ -653,11 +653,14 @@ BeginCopyTo(ParseState *pstate,
RelationGetRelationName(rel)),
errhint("Try the COPY (SELECT ...) TO variant.")));
else if (rel->rd_rel->relkind == RELKIND_MATVIEW)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("cannot copy from materialized view \"%s\"",
RelationGetRelationName(rel)),
errhint("Try the COPY (SELECT ...) TO variant.")));
{
if (!RelationIsPopulated(rel))
ereport(ERROR,
errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot copy from unpopulated materialized view \"%s\"",
RelationGetRelationName(rel)),
errhint("Use the REFRESH MATERIALIZED VIEW command."));
}
else if (rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),