Add initial SQL metrics implementation

Author: Ubuntu

continuous_eval/metrics/code/sql/sql_deterministic_metrics.py

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+from typing import List, Union
+
+import sqlparse
+
+from continuous_eval.metrics.base import Metric
+
+
+class SQLSyntaxMatch(Metric):
+    """
+    This metric evaluates the syntactic similarity between the generated SQL query and a set of ground truth queries.
+    It uses the sqlparse library to format and compare the SQL queries.
+    """
+
+    def __call__(self, answer: str, ground_truth_answers: Union[List[str], str]):
+        if isinstance(ground_truth_answers, str):
+            ground_truth_answers = [ground_truth_answers]
+
+        # Format the answer and ground truth answers using sqlparse for consistent comparison
+        formatted_answer = sqlparse.format(answer, reindent=True, keyword_case="upper")
+        formatted_ground_truths = [
+            sqlparse.format(gt, reindent=True, keyword_case="upper")
+            for gt in ground_truth_answers
+        ]
+
+        # Initialize the maximum match score
+        max_match_score = 0
+
+        # Compare the formatted answer with each formatted ground truth answer
+        for formatted_gt in formatted_ground_truths:
+            # Simple string comparison for now, can be improved with more sophisticated methods
+            match_score = float(formatted_answer == formatted_gt)
+            if match_score > max_match_score:
+                max_match_score = match_score
+
+        # Return the maximum match score
+        return {"SQL_Syntax_Match_Score": max_match_score}