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Support multi-line headers in COPY FROM command.

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The COPY FROM command now accepts a non-negative integer for the HEADER option,
allowing multiple header lines to be skipped. This is useful when the input
contains multi-line headers that should be ignored during data import.

Author: Shinya Kato <shinya11.kato@gmail.com>
Co-authored-by: Fujii Masao <masao.fujii@gmail.com>
Reviewed-by: Yugo Nagata <nagata@sraoss.co.jp>
Discussion: https://postgr.es/m/CAOzEurRPxfzbxqeOPF_AGnAUOYf=Wk0we+1LQomPNUNtyZGBZw@mail.gmail.com
This commit is contained in:
Fujii Masao
2025-07-03 15:27:26 +09:00
parent fd7d7b7191
commit bc2f348e87
10 changed files with 138 additions and 42 deletions
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17
src/backend/commands/copyfromparse.c
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@@ -771,21 +771,30 @@ static pg_attribute_always_inline bool
NextCopyFromRawFieldsInternal(CopyFromState cstate, char ***fields, int *nfields, bool is_csv)
{
int fldct;
bool done;
bool done = false;
/* only available for text or csv input */
Assert(!cstate->opts.binary);
/* on input check that the header line is correct if needed */
if (cstate->cur_lineno == 0 && cstate->opts.header_line)
if (cstate->cur_lineno == 0 && cstate->opts.header_line != COPY_HEADER_FALSE)
{
ListCell *cur;
TupleDesc tupDesc;
int lines_to_skip = cstate->opts.header_line;
/* If set to "match", one header line is skipped */
if (cstate->opts.header_line == COPY_HEADER_MATCH)
lines_to_skip = 1;
tupDesc = RelationGetDescr(cstate->rel);
cstate->cur_lineno++;
done = CopyReadLine(cstate, is_csv);
for (int i = 0; i < lines_to_skip; i++)
{
cstate->cur_lineno++;
if ((done = CopyReadLine(cstate, is_csv)))
break;
}
if (cstate->opts.header_line == COPY_HEADER_MATCH)
{