feat: add logical operations && comparison operations to OwnedColumn (#87)

# Rationale for this change
This PR is split out from #81 and continues #85.
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# What changes are included in this PR?
- add `NOT`, `AND` and `OR` to `column_operation.rs`
- add comparison operations to `OwnedColumn`
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# Are these changes tested?
Yes
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Author: iajoiner

crates/proof-of-sql/src/base/database/column_operation.rs

@@ -154,8 +154,35 @@ pub fn try_divide_column_types(
     Ok(ColumnType::Decimal75(precision, scale))
 }
 
+// Unary operations
+
+/// Negate a slice of boolean values.
+pub(super) fn slice_not(input: &[bool]) -> Vec<bool> {
+    input.iter().map(|l| -> bool { !*l }).collect::<Vec<_>>()
+}
+
 // Binary operations on slices of the same type
 
+/// Element-wise AND on two boolean slices of the same length.
+///
+/// We do not check for length equality here.
+pub(super) fn slice_and(lhs: &[bool], rhs: &[bool]) -> Vec<bool> {
+    lhs.iter()
+        .zip(rhs.iter())
+        .map(|(l, r)| -> bool { *l && *r })
+        .collect::<Vec<_>>()
+}
+
+/// Element-wise OR on two boolean slices of the same length.
+///
+/// We do not check for length equality here.
+pub(super) fn slice_or(lhs: &[bool], rhs: &[bool]) -> Vec<bool> {
+    lhs.iter()
+        .zip(rhs.iter())
+        .map(|(l, r)| -> bool { *l || *r })
+        .collect::<Vec<_>>()
+}
+
 /// Try to check whether two slices of the same length are equal element-wise.
 ///
 /// We do not check for length equality here.
@@ -1298,6 +1325,35 @@ mod test {
         ));
     }
 
+    // NOT
+    #[test]
+    fn we_can_negate_boolean_slices() {
+        let input = [true, false, true];
+        let actual = slice_not(&input);
+        let expected = vec![false, true, false];
+        assert_eq!(expected, actual);
+    }
+
+    // AND
+    #[test]
+    fn we_can_and_boolean_slices() {
+        let lhs = [true, false, true, false];
+        let rhs = [true, true, false, false];
+        let actual = slice_and(&lhs, &rhs);
+        let expected = vec![true, false, false, false];
+        assert_eq!(expected, actual);
+    }
+
+    // OR
+    #[test]
+    fn we_can_or_boolean_slices() {
+        let lhs = [true, false, true, false];
+        let rhs = [true, true, false, false];
+        let actual = slice_or(&lhs, &rhs);
+        let expected = vec![true, true, true, false];
+        assert_eq!(expected, actual);
+    }
+
     // =
     #[test]
     fn we_can_eq_slices() {

crates/proof-of-sql/src/base/database/column_operation_error.rs

@@ -1,5 +1,5 @@
 use crate::base::{database::ColumnType, math::decimal::DecimalError};
-use proof_of_sql_parser::intermediate_ast::BinaryOperator;
+use proof_of_sql_parser::intermediate_ast::{BinaryOperator, UnaryOperator};
 use thiserror::Error;
 
 /// Errors from operations on columns.
@@ -20,6 +20,15 @@ pub enum ColumnOperationError {
         right_type: ColumnType,
     },
 
+    /// Incorrect `ColumnType` in unary operations
+    #[error("{operator:?}(operand: {operand_type:?}) is not supported")]
+    UnaryOperationInvalidColumnType {
+        /// `UnaryOperator` that caused the error
+        operator: UnaryOperator,
+        /// `ColumnType` of the operand
+        operand_type: ColumnType,
+    },
+
     /// Overflow in integer operations
     #[error("Overflow in integer operation: {0}")]
     IntegerOverflow(String),