Fix clippy warnings

lib/src/dbs/channel.rs

@@ -100,7 +100,7 @@ impl Thing {
 		self,
 		ctx: &Runtime,
 		opt: &Options,
-		stm: &Statement,
+		_stm: &Statement,
 		txn: &Transaction,
 		chn: &Sender<(Option<Thing>, Value)>,
 	) -> Result<(), Error> {
@@ -122,7 +122,7 @@ impl Table {
 		self,
 		ctx: &Runtime,
 		opt: &Options,
-		stm: &Statement,
+		_stm: &Statement,
 		txn: &Transaction,
 		chn: &Sender<(Option<Thing>, Value)>,
 	) -> Result<(), Error> {

lib/src/sql/value/mod.rs

@@ -18,4 +18,5 @@ mod patch;
 mod pick;
 mod replace;
 mod set;
+mod single;
 mod value;

lib/src/sql/value/single.rs

@@ -0,0 +1,13 @@
+use crate::sql::value::Value;
+
+impl Value {
+	pub fn single(&self) -> &Self {
+		match self {
+			Value::Array(v) => match v.value.first() {
+				None => &Value::None,
+				Some(v) => v,
+			},
+			v => v,
+		}
+	}
+}