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db_include/utils/partcache.h

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+/*-------------------------------------------------------------------------
+ *
+ * partcache.h
+ *
+ * Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ *
+ * src/include/utils/partcache.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PARTCACHE_H
+#define PARTCACHE_H
+
+#include "access/attnum.h"
+#include "fmgr.h"
+#include "nodes/pg_list.h"
+#include "nodes/primnodes.h"
+#include "partitioning/partdefs.h"
+#include "utils/relcache.h"
+
+/*
+ * Information about the partition key of a relation
+ */
+typedef struct PartitionKeyData
+{
+	char		strategy;		/* partitioning strategy */
+	int16		partnatts;		/* number of columns in the partition key */
+	AttrNumber *partattrs;		/* attribute numbers of columns in the
+								 * partition key or 0 if it's an expr */
+	List	   *partexprs;		/* list of expressions in the partitioning
+								 * key, one for each zero-valued partattrs */
+
+	Oid		   *partopfamily;	/* OIDs of operator families */
+	Oid		   *partopcintype;	/* OIDs of opclass declared input data types */
+	FmgrInfo   *partsupfunc;	/* lookup info for support funcs */
+
+	/* Partitioning collation per attribute */
+	Oid		   *partcollation;
+
+	/* Type information per attribute */
+	Oid		   *parttypid;
+	int32	   *parttypmod;
+	int16	   *parttyplen;
+	bool	   *parttypbyval;
+	char	   *parttypalign;
+	Oid		   *parttypcoll;
+}			PartitionKeyData;
+
+
+extern PartitionKey RelationGetPartitionKey(Relation rel);
+extern List *RelationGetPartitionQual(Relation rel);
+extern Expr *get_partition_qual_relid(Oid relid);
+
+/*
+ * PartitionKey inquiry functions
+ */
+static inline int
+get_partition_strategy(PartitionKey key)
+{
+	return key->strategy;
+}
+
+static inline int
+get_partition_natts(PartitionKey key)
+{
+	return key->partnatts;
+}
+
+static inline List *
+get_partition_exprs(PartitionKey key)
+{
+	return key->partexprs;
+}
+
+/*
+ * PartitionKey inquiry functions - one column
+ */
+static inline int16
+get_partition_col_attnum(PartitionKey key, int col)
+{
+	return key->partattrs[col];
+}
+
+static inline Oid
+get_partition_col_typid(PartitionKey key, int col)
+{
+	return key->parttypid[col];
+}
+
+static inline int32
+get_partition_col_typmod(PartitionKey key, int col)
+{
+	return key->parttypmod[col];
+}
+
+static inline Oid
+get_partition_col_collation(PartitionKey key, int col)
+{
+	return key->partcollation[col];
+}
+
+#endif							/* PARTCACHE_H */