Add some missing wrappers (#1139)

* Add some missing wrappers:

sqlite3_value_subtype
sqlite3_result_subtype
sqlite3_changes64
sqlite3_db_readonly
sqlite3_txn_state
sqlite3_stmt_isexplain
sqlite3_vtab_config
sqlite3_index_info.idxFlags
sqlite3_index_info.colUsed
sqlite3_index_info.idxStr
sqlite3_vtab_collation

* Mark series VTab as innocuous and csv as direct only

src/vtab/series.rs

@@ -10,8 +10,8 @@ use std::os::raw::c_int;
 use crate::ffi;
 use crate::types::Type;
 use crate::vtab::{
-    eponymous_only_module, Context, IndexConstraintOp, IndexInfo, VTab, VTabConnection, VTabCursor,
-    Values,
+    eponymous_only_module, Context, IndexConstraintOp, IndexInfo, VTab, VTabConfig, VTabConnection,
+    VTabCursor, Values,
 };
 use crate::{Connection, Error, Result};
 
@@ -57,13 +57,14 @@ unsafe impl<'vtab> VTab<'vtab> for SeriesTab {
     type Cursor = SeriesTabCursor<'vtab>;
 
     fn connect(
-        _: &mut VTabConnection,
+        db: &mut VTabConnection,
         _aux: Option<&()>,
         _args: &[&[u8]],
     ) -> Result<(String, SeriesTab)> {
         let vtab = SeriesTab {
             base: ffi::sqlite3_vtab::default(),
         };
+        db.config(VTabConfig::Innocuous)?;
         Ok((
             "CREATE TABLE x(value,start hidden,stop hidden,step hidden)".to_owned(),
             vtab,
@@ -103,6 +104,8 @@ unsafe impl<'vtab> VTab<'vtab> for SeriesTab {
             let mut constraint_usage = info.constraint_usage(*j);
             constraint_usage.set_argv_index(n_arg);
             constraint_usage.set_omit(true);
+            #[cfg(all(test, feature = "modern_sqlite"))]
+            debug_assert_eq!(Ok("BINARY"), info.collation(*j));
         }
         if !(unusable_mask & !idx_num).is_empty() {
             return Err(Error::SqliteFailure(