refactor!: proof_of_sql_parser::intermediate_ast::UnaryOp with `sql…

…parser::ast::UnaryOp` in the proof-of-sql crate (#363)

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# Rationale for this change
This PR addresses the need to replace the
`proof_of_sql_parser::intermediate_ast::UnaryOp` with the
`sqlparser::ast::UnaryOp` in the `proof-of-sql` crate as part of a
larger transition toward integrating the `sqlparser` .

This change is a subtask of issue #235, with the main goal of
streamlining the repository by switching to the `sqlparser` crate and
gradually replacing intermediary constructs like
`proof_of_sql_parser::intermediate_ast` with `sqlparser::ast`.
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 Add `NestedLoopJoinExec`.
 Closes #345.

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# What changes are included in this PR?
- All instances of `proof_of_sql_parser::intermediate_ast::UnaryOp` have
been replaced with `sqlparser::ast::UnaryOp`
- Every usage of `UnaryOp` has been updated to maintain the original
functionality, ensuring no changes to the logic or behavior.
- Any unsupported `UnaryOp` variants from `sqlparser` have been
appropriately handled using existing error handling mechanisms (i.e.,
the `Unsupported `variant in `ExpressionEvaluationError`).
 
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- Speed up `HashJoinExec`.
- Route joins to `NestedLoopJoinExec` if the outer input is sufficiently
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# Are these changes tested?

Yes
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Part of #235

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

@@ -9,9 +9,10 @@ use crate::base::{
 };
 use alloc::{format, string::ToString, vec};
 use proof_of_sql_parser::{
-    intermediate_ast::{BinaryOperator, Expression, Literal, UnaryOperator},
+    intermediate_ast::{BinaryOperator, Expression, Literal},
     Identifier,
 };
+use sqlparser::ast::UnaryOperator;
 
 impl<S: Scalar> OwnedTable<S> {
     /// Evaluate an expression on the table.
@@ -20,7 +21,7 @@ impl<S: Scalar> OwnedTable<S> {
             Expression::Column(identifier) => self.evaluate_column(identifier),
             Expression::Literal(lit) => self.evaluate_literal(lit),
             Expression::Binary { op, left, right } => self.evaluate_binary_expr(*op, left, right),
-            Expression::Unary { op, expr } => self.evaluate_unary_expr(*op, expr),
+            Expression::Unary { op, expr } => self.evaluate_unary_expr((*op).into(), expr),
             _ => Err(ExpressionEvaluationError::Unsupported {
                 expression: format!("Expression {expr:?} is not supported yet"),
             }),
@@ -74,6 +75,10 @@ impl<S: Scalar> OwnedTable<S> {
         let column = self.evaluate(expr)?;
         match op {
             UnaryOperator::Not => Ok(column.element_wise_not()?),
+            // Handle unsupported unary operators
+            _ => Err(ExpressionEvaluationError::Unsupported {
+                expression: format!("Unary operator '{op}' is not supported."),
+            }),
         }
     }
 

crates/proof-of-sql/src/sql/parse/dyn_proof_expr_builder.rs

@@ -19,10 +19,11 @@ use crate::{
 };
 use alloc::{borrow::ToOwned, boxed::Box, format, string::ToString};
 use proof_of_sql_parser::{
-    intermediate_ast::{AggregationOperator, BinaryOperator, Expression, Literal, UnaryOperator},
+    intermediate_ast::{AggregationOperator, BinaryOperator, Expression, Literal},
     posql_time::{PoSQLTimeUnit, PoSQLTimestampError},
     Identifier,
 };
+use sqlparser::ast::UnaryOperator;
 
 /// Builder that enables building a `proofs::sql::proof_exprs::DynProofExpr` from
 /// a `proof_of_sql_parser::intermediate_ast::Expression`.
@@ -60,7 +61,7 @@ impl DynProofExprBuilder<'_> {
             Expression::Column(identifier) => self.visit_column(*identifier),
             Expression::Literal(lit) => self.visit_literal(lit),
             Expression::Binary { op, left, right } => self.visit_binary_expr(*op, left, right),
-            Expression::Unary { op, expr } => self.visit_unary_expr(*op, expr),
+            Expression::Unary { op, expr } => self.visit_unary_expr((*op).into(), expr),
             Expression::Aggregation { op, expr } => self.visit_aggregate_expr(*op, expr),
             _ => Err(ConversionError::Unprovable {
                 error: format!("Expression {expr:?} is not supported yet"),
@@ -136,6 +137,10 @@ impl DynProofExprBuilder<'_> {
         let expr = self.visit_expr(expr);
         match op {
             UnaryOperator::Not => DynProofExpr::try_new_not(expr?),
+            // Handle unsupported operators
+            _ => Err(ConversionError::UnsupportedOperation {
+                message: format!("{op:?}"),
+            }),
         }
     }
 

crates/proof-of-sql/src/sql/parse/error.rs

@@ -139,6 +139,13 @@ pub enum ConversionError {
         /// The underlying error
         error: String,
     },
+
+    #[snafu(display("Unsupported operator: {message}"))]
+    /// Unsupported operation
+    UnsupportedOperation {
+        /// The operator that is unsupported
+        message: String,
+    },
 }
 
 impl From<String> for ConversionError {

crates/proof-of-sql/src/sql/parse/query_context_builder.rs

@@ -9,15 +9,15 @@ use crate::base::{
         BigDecimalExt,
     },
 };
-use alloc::{boxed::Box, string::ToString, vec::Vec};
+use alloc::{boxed::Box, format, string::ToString, vec::Vec};
 use proof_of_sql_parser::{
     intermediate_ast::{
         AggregationOperator, AliasedResultExpr, BinaryOperator, Expression, Literal, OrderBy,
-        SelectResultExpr, Slice, TableExpression, UnaryOperator,
+        SelectResultExpr, Slice, TableExpression,
     },
     Identifier, ResourceId,
 };
-
+use sqlparser::ast::UnaryOperator;
 pub struct QueryContextBuilder<'a> {
     context: QueryContext,
     schema_accessor: &'a dyn SchemaAccessor,
@@ -137,7 +137,7 @@ impl<'a> QueryContextBuilder<'a> {
             Expression::Wildcard => Ok(ColumnType::BigInt), // Since COUNT(*) = COUNT(1)
             Expression::Literal(literal) => self.visit_literal(literal),
             Expression::Column(_) => self.visit_column_expr(expr),
-            Expression::Unary { op, expr } => self.visit_unary_expr(*op, expr),
+            Expression::Unary { op, expr } => self.visit_unary_expr((*op).into(), expr),
             Expression::Binary { op, left, right } => self.visit_binary_expr(*op, left, right),
             Expression::Aggregation { op, expr } => self.visit_agg_expr(*op, expr),
         }
@@ -192,6 +192,10 @@ impl<'a> QueryContextBuilder<'a> {
                 }
                 Ok(ColumnType::Boolean)
             }
+            // Handle unsupported operators
+            _ => Err(ConversionError::UnsupportedOperation {
+                message: format!("{op:?}"),
+            }),
         }
     }