1 files changed, 57 insertions, 0 deletions
diff --git a/src/include/commands/copyapi.h b/src/include/commands/copyapi.h
new file mode 100644
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+++ b/src/include/commands/copyapi.h
@@ -0,0 +1,57 @@
+/*-------------------------------------------------------------------------
+ *
+ * copyapi.h
+ *	  API for COPY TO handlers
+ *
+ *
+ * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/commands/copyapi.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef COPYAPI_H
+#define COPYAPI_H
+
+#include "commands/copy.h"
+
+/*
+ * API structure for a COPY TO format implementation. Note this must be
+ * allocated in a server-lifetime manner, typically as a static const struct.
+ */
+typedef struct CopyToRoutine
+{
+	/*
+	 * Set output function information. This callback is called once at the
+	 * beginning of COPY TO.
+	 *
+	 * 'finfo' can be optionally filled to provide the catalog information of
+	 * the output function.
+	 *
+	 * 'atttypid' is the OID of data type used by the relation's attribute.
+	 */
+	void		(*CopyToOutFunc) (CopyToState cstate, Oid atttypid,
+								  FmgrInfo *finfo);
+
+	/*
+	 * Start a COPY TO. This callback is called once at the beginning of COPY
+	 * TO.
+	 *
+	 * 'tupDesc' is the tuple descriptor of the relation from where the data
+	 * is read.
+	 */
+	void		(*CopyToStart) (CopyToState cstate, TupleDesc tupDesc);
+
+	/*
+	 * Write one row stored in 'slot' to the destination.
+	 */
+	void		(*CopyToOneRow) (CopyToState cstate, TupleTableSlot *slot);
+
+	/*
+	 * End a COPY TO. This callback is called once at the end of COPY TO.
+	 */
+	void		(*CopyToEnd) (CopyToState cstate);
+} CopyToRoutine;
+
+#endif							/* COPYAPI_H */