database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-17 06:41:09 +03:00
Code Activity

Add a DEFAULT option to COPY FROM

Browse Source 
This allows for a string which if an input field matches causes the
column's default value to be inserted. The advantage of this is that
the default can be inserted in some rows and not others, for which
non-default data is available.

The file_fdw extension is also modified to take allow use of this
option.

Israel Barth Rubio

Discussion: https://postgr.es/m/CAO_rXXAcqesk6DsvioOZ5zmeEmpUN5ktZf-9=9yu+DTr0Xr8Uw@mail.gmail.com
This commit is contained in:
Andrew Dunstan
2023-03-13 10:01:56 -04:00
parent 7b14e20b12
commit 9f8377f7a2
15 changed files with 447 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
src/backend/commands/copyfrom.c
View File

@ -1565,11 +1565,11 @@ BeginCopyFrom(ParseState *pstate,
&in_func_oid, &typioparams[attnum - 1]);
fmgr_info(in_func_oid, &in_functions[attnum - 1]);
/* Get default info if needed */
if (!list_member_int(cstate->attnumlist, attnum) && !att->attgenerated)
/* Get default info if available */
defexprs[attnum - 1] = NULL;
if (!att->attgenerated)
{
/* attribute is NOT to be copied from input */
/* use default value if one exists */
Expr *defexpr = (Expr *) build_column_default(cstate->rel,
attnum);
@ -1579,9 +1579,15 @@ BeginCopyFrom(ParseState *pstate,
defexpr = expression_planner(defexpr);
/* Initialize executable expression in copycontext */
defexprs[num_defaults] = ExecInitExpr(defexpr, NULL);
defmap[num_defaults] = attnum - 1;
num_defaults++;
defexprs[attnum - 1] = ExecInitExpr(defexpr, NULL);
/* if NOT copied from input */
/* use default value if one exists */
if (!list_member_int(cstate->attnumlist, attnum))
{
defmap[num_defaults] = attnum - 1;
num_defaults++;
}
/*
* If a default expression looks at the table being loaded,