Introduce access/{table.h, relation.h}, for generic functions from heapam.h.

access/heapam contains functions that are very storage specific (say
heap_insert() and a lot of lower level functions), and fairly generic
infrastructure like relation_open(), heap_open() etc.  In the upcoming
pluggable storage work we're introducing a layer between table
accesses in general and heapam, to allow for different storage
methods. For a bit cleaner separation it thus seems advantageous to
move generic functions like the aforementioned to their own headers.

access/relation.h will contain relation_open() etc, and access/table.h
will contain table_open() (formerly known as heap_open()). I've decided
for table.h not to include relation.h, but we might change that at a
later stage.

relation.h already exists in another directory, but the other
plausible name (rel.h) also conflicts. It'd be nice if there were a
non-conflicting name, but nobody came up with a suggestion. It's
possible that the appropriate way to address the naming conflict would
be to rename nodes/relation.h, which isn't particularly well named.

To avoid breaking a lot of extensions that just use heap_open() etc,
table.h has macros mapping the old names to the new ones, and heapam.h
includes relation, table.h.  That also allows to keep the
bulk renaming of existing callers in a separate commit.

Author: Andres Freund
Discussion: https://postgr.es/m/[email protected]

1 files changed, 17 insertions, 0 deletions

diff --git a/src/backend/access/table/Makefile b/src/backend/access/table/Makefile
new file mode 100644
index 00000000000..ac1de5a52b0
--- /dev/null
+++ b/src/backend/access/table/Makefile
@@ -0,0 +1,17 @@
+#-------------------------------------------------------------------------
+#
+# Makefile--
+#    Makefile for access/table
+#
+# IDENTIFICATION
+#    src/backend/access/table/Makefile
+#
+#-------------------------------------------------------------------------
+
+subdir = src/backend/access/table
+top_builddir = ../../../..
+include $(top_builddir)/src/Makefile.global
+
+OBJS = table.o
+
+include $(top_srcdir)/src/backend/common.mk