Subject: [PATCH v35 6/7] Add support for implementing custom COPY FROM format as extension

From: Sutou Kouhei <[email-masked]>
Date: Mon, 25 Nov 2024 14:21:39 +0900

* Add CopyFromStateData::opaque that can be used to keep data for
  custom COPY From format implementation
* Export CopyGetData() to get the next data as
  CopyFromStateGetData()
---
 src/backend/commands/copyfromparse.c     | 11 +++++++++++
 src/include/commands/copyapi.h           |  2 ++
 src/include/commands/copyfrom_internal.h |  3 +++
 3 files changed, 16 insertions(+)

diff --git a/src/backend/commands/copyfromparse.c b/src/backend/commands/copyfromparse.c
index 17e51f02e04..d8fd238e72b 100644
--- a/src/backend/commands/copyfromparse.c
+++ b/src/backend/commands/copyfromparse.c
@@ -739,6 +739,17 @@ CopyReadBinaryData(CopyFromState cstate, char *dest, int nbytes)
 	return copied_bytes;
 }
 
+/*
+ * Export CopyGetData() for extensions. We want to keep CopyGetData() as a
+ * static function for optimization. CopyGetData() calls in this file may be
+ * optimized by a compiler.
+ */
+int
+CopyFromStateGetData(CopyFromState cstate, void *dest, int minread, int maxread)
+{
+	return CopyGetData(cstate, dest, minread, maxread);
+}
+
 /*
  * This function is exposed for use by extensions that read raw fields in the
  * next line. See NextCopyFromRawFieldsInternal() for details.
diff --git a/src/include/commands/copyapi.h b/src/include/commands/copyapi.h
index 895c105d8d8..2044d8b8c4c 100644
--- a/src/include/commands/copyapi.h
+++ b/src/include/commands/copyapi.h
@@ -108,4 +108,6 @@ typedef struct CopyFromRoutine
 	void		(*CopyFromEnd) (CopyFromState cstate);
 } CopyFromRoutine;
 
+extern int	CopyFromStateGetData(CopyFromState cstate, void *dest, int minread, int maxread);
+
 #endif							/* COPYAPI_H */
diff --git a/src/include/commands/copyfrom_internal.h b/src/include/commands/copyfrom_internal.h
index 3a306e3286e..af425cf5fd9 100644
--- a/src/include/commands/copyfrom_internal.h
+++ b/src/include/commands/copyfrom_internal.h
@@ -181,6 +181,9 @@ typedef struct CopyFromStateData
 #define RAW_BUF_BYTES(cstate) ((cstate)->raw_buf_len - (cstate)->raw_buf_index)
 
 	uint64		bytes_processed;	/* number of bytes processed so far */
+
+	/* For custom format implementation */
+	void	   *opaque;			/* private space */
 } CopyFromStateData;
 
 extern void ReceiveCopyBegin(CopyFromState cstate);
-- 
2.47.2

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 filename="v35-0007-Add-CopyFromSkipErrorRow-for-custom-COPY-format-.patch"