public final BooleanExpression isEmpty() {
        if (empty == null) {
            empty = Expressions.booleanOperation(Ops.MAP_IS_EMPTY, mixin);
        }
        return empty;
    }
Create a {@code this.isEmpty()} expression

@return this.isEmpty()
querydsl-core/src/main/java/com/querydsl/core/types/dsl/MapExpressionBase.java