Allow Expression<bool?> in more places

moor/lib/src/runtime/api/batch.dart

@@ -82,7 +82,7 @@ class Batch {
   /// [UpdateStatement.write] or the [documentation with examples](https://moor.simonbinder.eu/docs/getting-started/writing_queries/#updates-and-deletes)
   void update<T extends Table, D extends DataClass>(
       TableInfo<T, D> table, Insertable<D> row,
-      {Expression<bool> Function(T table)? where}) {
+      {Expression<bool?> Function(T table)? where}) {
     _addUpdate(table, UpdateKind.update);
     final stmt = UpdateStatement(_engine, table);
     if (where != null) stmt.where(where);
@@ -133,7 +133,7 @@ class Batch {
   /// See also:
   ///  - [QueryEngine.delete]
   void deleteWhere<T extends Table, D extends DataClass>(
-      TableInfo<T, D> table, Expression<bool> Function(T tbl) filter) {
+      TableInfo<T, D> table, Expression<bool?> Function(T tbl) filter) {
     _addUpdate(table, UpdateKind.delete);
     final stmt = DeleteStatement(_engine, table)..where(filter);
     _addContext(stmt.constructQuery());

moor/lib/src/runtime/query_builder/components/join.dart

@@ -31,7 +31,7 @@ class Join<T extends Table, D extends DataClass> extends Component {
 
   /// For joins that aren't [_JoinType.cross], contains an additional predicate
   /// that must be matched for the join.
-  final Expression<bool>? on;
+  final Expression<bool?>? on;
 
   /// Whether [table] should appear in the result set (defaults to true).
   ///

moor/lib/src/runtime/query_builder/expressions/aggregate.dart

@@ -9,7 +9,7 @@ part of '../query_builder.dart';
 ///
 /// This is equivalent to the `COUNT(*) FILTER (WHERE filter)` sql function. The
 /// filter will be omitted if null.
-Expression<int> countAll({Expression<bool>? filter}) {
+Expression<int> countAll({Expression<bool?>? filter}) {
   return _AggregateExpression('COUNT', const _StarFunctionParameter(),
       filter: filter);
 }
@@ -24,7 +24,7 @@ extension BaseAggregate<DT> on Expression<DT> {
   /// counted twice. An optional [filter] can be used to only include values
   /// matching the filter. Note that [filter] is only available from sqlite
   /// 3.30 and most devices will use an older sqlite version.
-  Expression<int> count({bool? distinct, Expression<bool>? filter}) {
+  Expression<int> count({bool? distinct, Expression<bool?>? filter}) {
     return _AggregateExpression('COUNT', this,
         filter: filter, distinct: distinct);
   }
@@ -88,7 +88,7 @@ class _AggregateExpression<D> extends Expression<D> {
   final Where? filter;
 
   _AggregateExpression(this.functionName, this.parameter,
-      {Expression<bool>? filter, bool? distinct})
+      {Expression<bool?>? filter, bool? distinct})
       : filter = filter != null ? Where(filter) : null,
         distinct = distinct ?? false;
 

moor/lib/src/runtime/query_builder/expressions/comparable.dart

@@ -4,53 +4,57 @@ part of '../query_builder.dart';
 extension ComparableExpr<DT extends Comparable<dynamic>?> on Expression<DT> {
   /// Returns an expression that is true if this expression is strictly bigger
   /// than the other expression.
-  Expression<bool> isBiggerThan(Expression<DT> other) {
+  Expression<bool?> isBiggerThan(Expression<DT> other) {
     return _Comparison(this, _ComparisonOperator.more, other);
   }
 
   /// Returns an expression that is true if this expression is strictly bigger
   /// than the other value.
-  Expression<bool> isBiggerThanValue(DT other) => isBiggerThan(Variable(other));
+  Expression<bool?> isBiggerThanValue(DT other) {
+    return isBiggerThan(Variable(other));
+  }
 
   /// Returns an expression that is true if this expression is bigger than or
   /// equal to he other expression.
-  Expression<bool> isBiggerOrEqual(Expression<DT> other) {
+  Expression<bool?> isBiggerOrEqual(Expression<DT> other) {
     return _Comparison(this, _ComparisonOperator.moreOrEqual, other);
   }
 
   /// Returns an expression that is true if this expression is bigger than or
   /// equal to he other value.
-  Expression<bool> isBiggerOrEqualValue(DT other) =>
-      isBiggerOrEqual(Variable(other));
+  Expression<bool?> isBiggerOrEqualValue(DT other) {
+    return isBiggerOrEqual(Variable(other));
+  }
 
   /// Returns an expression that is true if this expression is strictly smaller
   /// than the other expression.
-  Expression<bool> isSmallerThan(Expression<DT> other) {
+  Expression<bool?> isSmallerThan(Expression<DT> other) {
     return _Comparison(this, _ComparisonOperator.less, other);
   }
 
   /// Returns an expression that is true if this expression is strictly smaller
   /// than the other value.
-  Expression<bool> isSmallerThanValue(DT other) =>
+  Expression<bool?> isSmallerThanValue(DT other) =>
       isSmallerThan(Variable(other));
 
   /// Returns an expression that is true if this expression is smaller than or
   /// equal to he other expression.
-  Expression<bool> isSmallerOrEqual(Expression<DT> other) {
+  Expression<bool?> isSmallerOrEqual(Expression<DT> other) {
     return _Comparison(this, _ComparisonOperator.lessOrEqual, other);
   }
 
   /// Returns an expression that is true if this expression is smaller than or
   /// equal to he other value.
-  Expression<bool> isSmallerOrEqualValue(DT other) =>
-      isSmallerOrEqual(Variable(other));
+  Expression<bool?> isSmallerOrEqualValue(DT other) {
+    return isSmallerOrEqual(Variable(other));
+  }
 
   /// Returns an expression evaluating to true if this expression is between
   /// [lower] and [higher] (both inclusive).
   ///
   /// If [not] is set, the expression will be negated. To compare this
   /// expression against two values, see
-  Expression<bool> isBetween(Expression<DT> lower, Expression<DT> higher,
+  Expression<bool?> isBetween(Expression<DT> lower, Expression<DT> higher,
       {bool not = false}) {
     return _BetweenExpression(
         target: this, lower: lower, higher: higher, not: not);
@@ -60,7 +64,7 @@ extension ComparableExpr<DT extends Comparable<dynamic>?> on Expression<DT> {
   /// [lower] and [higher] (both inclusive).
   ///
   /// If [not] is set, the expression will be negated.
-  Expression<bool> isBetweenValues(DT lower, DT higher, {bool not = false}) {
+  Expression<bool?> isBetweenValues(DT lower, DT higher, {bool not = false}) {
     return _BetweenExpression(
       target: this,
       lower: Variable<DT>(lower),
@@ -70,7 +74,7 @@ extension ComparableExpr<DT extends Comparable<dynamic>?> on Expression<DT> {
   }
 }
 
-class _BetweenExpression extends Expression<bool> {
+class _BetweenExpression extends Expression<bool?> {
   final Expression target;
 
   // https://www.sqlite.org/lang_expr.html#between

moor/lib/src/runtime/query_builder/expressions/expression.dart

@@ -58,13 +58,13 @@ abstract class Expression<D> implements FunctionParameter {
 
   /// An expression that is true if `this` resolves to any of the values in
   /// [values].
-  Expression<bool> isIn(Iterable<D> values) {
+  Expression<bool?> isIn(Iterable<D> values) {
     return _InExpression(this, values.toList(), false);
   }
 
   /// An expression that is true if `this` does not resolve to any of the values
   /// in [values].
-  Expression<bool> isNotIn(Iterable<D> values) {
+  Expression<bool?> isNotIn(Iterable<D> values) {
     return _InExpression(this, values.toList(), true);
   }
 

moor/lib/src/runtime/query_builder/expressions/in.dart

@@ -1,6 +1,6 @@
 part of '../query_builder.dart';
 
-class _InExpression<T> extends Expression<bool> {
+class _InExpression<T> extends Expression<bool?> {
   final Expression<T> _expression;
   final List<T> _values;
   final bool _not;

moor/lib/src/runtime/query_builder/statements/query.dart

@@ -176,7 +176,7 @@ mixin SingleTableQueryMixin<T extends Table, D extends DataClass>
   ///    which explains how to express most SQL expressions in Dart.
   /// If you want to remove duplicate rows from a query, use the `distinct`
   /// parameter on [QueryEngine.select].
-  void where(Expression<bool> Function(T tbl) filter) {
+  void where(Expression<bool?> Function(T tbl) filter) {
     final predicate = filter(table.asDslTable);
 
     if (whereExpr == null) {

moor/lib/src/runtime/query_builder/statements/select/select_with_join.dart

@@ -165,7 +165,7 @@ class JoinedSelectStatement<FirstT extends Table, FirstD extends DataClass>
   /// Groups the result by values in [expressions].
   ///
   /// An optional [having] attribute can be set to exclude certain groups.
-  void groupBy(Iterable<Expression> expressions, {Expression<bool>? having}) {
+  void groupBy(Iterable<Expression> expressions, {Expression<bool?>? having}) {
     _groupBy = GroupBy._(expressions.toList(), having);
   }