Add the ability to disable the covering-index-scan optimization at compile-time,

start-time, or at run-time.  Add test cases to check this configurability.

FossilOrigin-Name: ccb8ecc30c8e6c7760131250297c2e452bbac43b

1 files changed, 30 insertions, 0 deletions

diff --git a/src/test_malloc.c b/src/test_malloc.c
index f52894d9e..e1420de64 100644
--- a/src/test_malloc.c
+++ b/src/test_malloc.c
@@ -1198,6 +1198,35 @@ static int test_config_uri(
 }
 
 /*
+** Usage:    sqlite3_config_cis  BOOLEAN
+**
+** Enables or disables the use of the covering-index scan optimization.
+** SQLITE_CONFIG_COVERING_INDEX_SCAN.
+*/
+static int test_config_cis(
+  void * clientData, 
+  Tcl_Interp *interp,
+  int objc,
+  Tcl_Obj *CONST objv[]
+){
+  int rc;
+  int bUseCis;
+
+  if( objc!=2 ){
+    Tcl_WrongNumArgs(interp, 1, objv, "BOOL");
+    return TCL_ERROR;
+  }
+  if( Tcl_GetBooleanFromObj(interp, objv[1], &bUseCis) ){
+    return TCL_ERROR;
+  }
+
+  rc = sqlite3_config(SQLITE_CONFIG_COVERING_INDEX_SCAN, bUseCis);
+  Tcl_SetResult(interp, (char *)sqlite3TestErrorName(rc), TCL_VOLATILE);
+
+  return TCL_OK;
+}
+
+/*
 ** Usage:    sqlite3_dump_memsys3  FILENAME
 **           sqlite3_dump_memsys5  FILENAME
 **
@@ -1447,6 +1476,7 @@ int Sqlitetest_malloc_Init(Tcl_Interp *interp){
      { "sqlite3_config_lookaside",   test_config_lookaside         ,0 },
      { "sqlite3_config_error",       test_config_error             ,0 },
      { "sqlite3_config_uri",         test_config_uri               ,0 },
+     { "sqlite3_config_cis",         test_config_cis               ,0 },
      { "sqlite3_db_config_lookaside",test_db_config_lookaside      ,0 },
      { "sqlite3_dump_memsys3",       test_dump_memsys3             ,3 },
      { "sqlite3_dump_memsys5",       test_dump_memsys3             ,5 },