fix AI commits

Author: sycai

packages/bigframes/bigframes/bigquery/_operations/ai.py

@@ -819,9 +819,9 @@ def if_(
     connection_id: str | None = None,
     endpoint: str | None = None,
     optimization_mode: Literal["minimize_cost", "maximize_quality"] = "minimize_cost",
-    max_error_ratio: float = 1.0,
-) -> series.Series:
     max_error_ratio: float | None = None,
+) -> series.Series:
+    """
     Evaluates the prompt to True or False. Compared to `ai.generate_bool()`, this function
     provides optimization such that not all rows are evaluated with the LLM.
 

packages/bigframes/bigframes/core/compile/sqlglot/expressions/ai_ops.py

@@ -139,11 +139,11 @@ def _construct_named_args(op: ops.ScalarOp) -> list[sge.Kwarg]:
                     expression=sge.JSON(this=sge.Literal.string(value)),
                 )
             )
-        elif field == "optimization_mode" and value is not None:
+        elif field == "optimization_mode":
             args.append(
                 sge.Kwarg(this=field, expression=sge.Literal.string(value.upper()))
             )
-        elif field == "max_error_ratio" and value is not None:
+        elif field == "max_error_ratio":
             args.append(sge.Kwarg(this=field, expression=sge.Literal.number(value)))
         elif field == "request_type":
             args.append(