diff --git a/01.workspace/heave/src/fun/sqlite_build_statement.rs b/01.workspace/heave/src/fun/sqlite_build_statement.rs
index 34f7554..9add4c3 100644
--- a/01.workspace/heave/src/fun/sqlite_build_statement.rs
+++ b/01.workspace/heave/src/fun/sqlite_build_statement.rs
@@ -24,6 +24,7 @@ pub fn run(filter: &Filter) -> Result<String, FailedTo> {
             (Comparison::Equal, Condition::Bool(_)) => {
                 compose_fragment(name, "value_bool", "=", i + 1)
             }
+            (_, Condition::Bool(_)) => return Err(FailedTo::ComposeFilter),
             // SIGNED INT
             (Comparison::Equal, Condition::SignedInt(_)) => {
                 compose_fragment(name, "value_int", "=", i + 1)
diff --git a/01.workspace/heave/src/str/comparison.rs b/01.workspace/heave/src/str/comparison.rs
index ae5df96..2c978c6 100644
--- a/01.workspace/heave/src/str/comparison.rs
+++ b/01.workspace/heave/src/str/comparison.rs
@@ -5,4 +5,8 @@ pub enum E {
     GreaterOrEqual,
     Lesser,
     LesserOrEqual,
+    IsExactly,
+    StartsWith,
+    EndsWith,
+    Contains,
 }
diff --git a/01.workspace/heave/src/str/failed_to.rs b/01.workspace/heave/src/str/failed_to.rs
index 052dec5..64216da 100644
--- a/01.workspace/heave/src/str/failed_to.rs
+++ b/01.workspace/heave/src/str/failed_to.rs
@@ -3,6 +3,8 @@ use crate::*;
 /// Represents the possible failures that can occur in the library.
 #[derive(Debug, PartialEq, PartialOrd, Eq, Ord, Clone, Copy, Hash)]
 pub enum FailedTo {
+    /// Failed to compose filter statement
+    ComposeFilter,
     /// Failed to convert from Entity to type.
     ConvertEntity,
     /// Failed to convert from type to Entity.