Added pg_proc table to the catalog. Contains the definition of functions.

Also improved the loading code for some catalog tables.

pglablib/PgProc.h

@@ -0,0 +1,48 @@
+#ifndef PGPROC_H
+#define PGPROC_H
+
+#include <QString>
+#include <libpq-fe.h>
+#include "Pgsql_Value.h"
+
+class PgProc {
+public:
+	Oid oid = InvalidOid; // oid
+	QString proname; // name
+	Oid pronamespace = InvalidOid; // oid
+	Oid proowner = InvalidOid; // oid
+	Oid prolang = InvalidOid; // oid
+	float procost = 0.f; // float4
+	float prorows = 0.f; // float4
+	Oid provariadic = InvalidOid; // oid
+	QString protransform; // regproc
+	bool proisagg = false; // bool
+	bool proiswindow = false; // bool
+	bool prosecdef = false; // bool
+	bool proleakproof = false; // bool
+	bool proisstrict = false; // bool
+	bool proretset = false; // bool
+	char provolatile = '\0'; // char
+	char proparallel = '\0'; // char, version >= 9.6
+	int16_t pronargs = 0; // int2
+	int16_t pronargdefaults = 0; // int2
+	Oid prorettype = InvalidOid; // oid
+	std::vector<Oid> proargtypes; // oid[]
+	std::vector<Oid> proallargtypes; // oid[]
+	std::vector<char> proargmodes; // char[]
+	std::vector<QString> proargnames; // text[]
+	std::optional<QString> proargdefaults; // pg_node_tree
+	std::vector<Oid> protrftypes; // oid[], version >= 9.5
+	QString prosrc; // text
+	QString probin; // text
+	std::vector<QString> proconfig; // text[]
+	std::vector<QString> proacl; // aclitem[]
+
+	bool operator==(Oid _oid) const { return oid == _oid; }
+	bool operator==(const QString &n) const { return proname == n; }
+	bool operator<(Oid _oid) const { return oid < _oid; }
+	bool operator<(const PgProc &rhs) const { return oid < rhs.oid; }
+
+};
+
+#endif // PGPROC_H