[sql] SQLite patch to implement "smart" auto-vacuum.

third_party/sqlite/src/src/pragma.h

 /* DO NOT EDIT!
 ** This file is automatically generated by the script at
 ** ../tool/mkpragmatab.tcl.  To update the set of pragmas, edit
 ** that script and rerun it.
 */
 
 /* The various pragma types */
 #define PragTyp_HEADER_VALUE                   0
 #define PragTyp_AUTO_VACUUM                    1
 #define PragTyp_FLAG                           2
@@ skipping 30 matching lines @@
 #define PragTyp_TEMP_STORE_DIRECTORY          33
 #define PragTyp_THREADS                       34
 #define PragTyp_WAL_AUTOCHECKPOINT            35
 #define PragTyp_WAL_CHECKPOINT                36
 #define PragTyp_ACTIVATE_EXTENSIONS           37
 #define PragTyp_HEXKEY                        38
 #define PragTyp_KEY                           39
 #define PragTyp_REKEY                         40
 #define PragTyp_LOCK_STATUS                   41
 #define PragTyp_PARSER_TRACE                  42
+#define PragTyp_AUTO_VACUUM_SLACK_PAGES       43
 
 /* Property flags associated with various pragma. */
 #define PragFlg_NeedSchema 0x01 /* Force schema load before running */
 #define PragFlg_NoColumns  0x02 /* OP_ResultRow called with zero columns */
 #define PragFlg_NoColumns1 0x04 /* zero columns if RHS argument is present */
 #define PragFlg_ReadOnly   0x08 /* Read-only HEADER_VALUE */
 #define PragFlg_Result0    0x10 /* Acts as query when no argument */
 #define PragFlg_Result1    0x20 /* Acts as query when has one argument */
 #define PragFlg_SchemaOpt  0x40 /* Schema restricts name search if present */
 #define PragFlg_SchemaReq  0x80 /* Schema required - "main" is default */
@@ skipping 77 matching lines @@
   /* ColNames:  */ 0, 0,
   /* iArg:      */ BTREE_APPLICATION_ID },
 #endif
 #if !defined(SQLITE_OMIT_AUTOVACUUM)
  {/* zName:     */ "auto_vacuum",
   /* ePragTyp:  */ PragTyp_AUTO_VACUUM,
   /* ePragFlg:  */ PragFlg_NeedSchema|PragFlg_Result0|PragFlg_SchemaReq|PragFlg_NoColumns1,
   /* ColNames:  */ 0, 0,
   /* iArg:      */ 0 },
 #endif
+#if !defined(SQLITE_OMIT_AUTOVACUUM)
+  { /* zName:     */ "auto_vacuum_slack_pages",
+    /* ePragTyp:  */ PragTyp_AUTO_VACUUM_SLACK_PAGES,
+    /* ePragFlg:  */ PragFlg_NeedSchema|PragFlg_Result0|PragFlg_SchemaReq|PragFlg_NoColumns1,
+    /* ColNames:  */ 0, 0,
+    /* iArg:      */ 0 },
+#endif
 #if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
 #if !defined(SQLITE_OMIT_AUTOMATIC_INDEX)
  {/* zName:     */ "automatic_index",
   /* ePragTyp:  */ PragTyp_FLAG,
   /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
   /* ColNames:  */ 0, 0,
   /* iArg:      */ SQLITE_AutoIndex },
 #endif
 #endif
  {/* zName:     */ "busy_timeout",
@@ skipping 440 matching lines @@
 #endif
 #if !defined(SQLITE_OMIT_FLAG_PRAGMAS)
  {/* zName:     */ "writable_schema",
   /* ePragTyp:  */ PragTyp_FLAG,
   /* ePragFlg:  */ PragFlg_Result0|PragFlg_NoColumns1,
   /* ColNames:  */ 0, 0,
   /* iArg:      */ SQLITE_WriteSchema|SQLITE_RecoveryMode },
 #endif
 };
 /* Number of pragmas: 60 on by default, 73 total. */