Add support for foreign keys to hypertables

Currrently we only allow Hypertables references other tables, with
this patch the opposite direction is supported as well and tables
can have foreign key references into hypertables.

.unreleased/pr_6989

@@ -0,0 +1 @@
+Implements: #6989 Add support for foreign keys from plain tables to hypertables

coccinelle/namedata.cocci

@@ -16,12 +16,13 @@ struct I1
 }
 
 @rule_namedata_strlcpy@
-expression E1, E2;
+identifier I1;
+expression E1;
 symbol NAMEDATALEN;
 @@
-- strlcpy(E1, E2, NAMEDATALEN);
+- strlcpy(I1, E1, NAMEDATALEN);
 + /* You are using strlcpy with NAMEDATALEN, please consider using NameData and namestrcpy instead. */
-+ namestrcpy(E1, E2);
++ namestrcpy(I1, E1);
 
 @rule_namedata_memcpy@
 expression E1, E2;

src/CMakeLists.txt

@@ -21,6 +21,7 @@ set(SOURCES
     extension.c
     extension_constants.c
     expression_utils.c
+    foreign_key.c
     gapfill.c
     guc.c
     histogram.c

src/chunk_constraint.c

@@ -33,6 +33,7 @@
 #include "dimension_vector.h"
 #include "errors.h"
 #include "export.h"
+#include "foreign_key.h"
 #include "hypercube.h"
 #include "hypertable.h"
 #include "partitioning.h"
@@ -512,6 +513,9 @@ ts_chunk_constraints_create(const Hypertable *ht, const Chunk *chunk)
 		Assert(list_length(cookedconstrs) == list_length(newconstrs));
 		CommandCounterIncrement();
 	}
+
+	/* Copy FK triggers to this chunk */
+	ts_chunk_copy_referencing_fk(ht, chunk);
 }
 
 ScanIterator