fix gcc 8 compiler warnings

There were two newly enabled warnings:
1. cast for a function pointers. Affected sql_analyse.h, mi_write.c
   and ma_write.cc, mf_iocache-t.cc, mysqlbinlog.cc, encryption.cc, etc

2. memcpy/memset of nontrivial structures. Fixed as:
* the warning disabled for InnoDB
* TABLE, TABLE_SHARE, and TABLE_LIST got a new method reset() which
  does the bzero(), which is safe for these classes, but any other
  bzero() will still cause a warning
* Table_scope_and_contents_source_st uses `TABLE_LIST *` (trivial)
  instead of `SQL_I_List<TABLE_LIST>` (not trivial) so it's safe to
  bzero now.
* added casts in debug_sync.cc and sql_select.cc (for JOIN)
* move assignment method for MDL_request instead of memcpy()
* PARTIAL_INDEX_INTERSECT_INFO::init() instead of bzero()
* remove constructor from READ_RECORD() to make it trivial
* replace some memcpy() with c++ copy assignments

1 files changed, 16 insertions, 7 deletions

diff --git a/client/mysqlbinlog.cc b/client/mysqlbinlog.cc
index 2c05bb806a9..4ba76cb3ba1 100644
--- a/client/mysqlbinlog.cc
+++ b/client/mysqlbinlog.cc
@@ -2867,16 +2867,25 @@ void *sql_alloc(size_t size)
   return alloc_root(&s_mem_root, size);
 }
 
+uint e_key_get_latest_version_func(uint) { return 1; }
+uint e_key_get_func(uint, uint, uchar*, uint*) { return 1; }
+uint e_ctx_size_func(uint, uint) { return 1; }
+int e_ctx_init_func(void *, const uchar*, uint, const uchar*, uint,
+                    int, uint, uint) { return 1; }
+int e_ctx_update_func(void *, const uchar*, uint, uchar*, uint*) { return 1; }
+int e_ctx_finish_func(void *, uchar*, uint*) { return 1; }
+uint e_encrypted_length_func(uint, uint, uint) { return 1; }
+
 uint dummy1() { return 1; }
 struct encryption_service_st encryption_handler=
 {
-  (uint(*)(uint))dummy1,
-  (uint(*)(uint, uint, uchar*, uint*))dummy1,
-  (uint(*)(uint, uint))dummy1,
-  (int (*)(void*, const uchar*, uint, const uchar*, uint, int, uint, uint))dummy1,
-  (int (*)(void*, const uchar*, uint, uchar*, uint*))dummy1,
-  (int (*)(void*, uchar*, uint*))dummy1,
-  (uint (*)(uint, uint, uint))dummy1
+  e_key_get_latest_version_func,
+  e_key_get_func,
+  e_ctx_size_func,
+  e_ctx_init_func,
+  e_ctx_update_func,
+  e_ctx_finish_func,
+  e_encrypted_length_func
 };
 
 /*