andygrove commented on code in PR #307:
URL: https://github.com/apache/datafusion-comet/pull/307#discussion_r1584909396


##########
core/src/execution/datafusion/expressions/cast.rs:
##########
@@ -142,6 +230,193 @@ impl Cast {
     }
 }
 
+fn cast_string_to_i8(str: &str, eval_mode: EvalMode) -> 
CometResult<Option<i8>> {
+    Ok(cast_string_to_int_with_range_check(
+        str,
+        eval_mode,
+        "TINYINT",
+        i8::MIN as i32,
+        i8::MAX as i32,
+    )?
+    .map(|v| v as i8))
+}
+
+fn cast_string_to_i16(str: &str, eval_mode: EvalMode) -> 
CometResult<Option<i16>> {
+    Ok(cast_string_to_int_with_range_check(
+        str,
+        eval_mode,
+        "SMALLINT",
+        i16::MIN as i32,
+        i16::MAX as i32,
+    )?
+    .map(|v| v as i16))
+}
+
+fn cast_string_to_i32(str: &str, eval_mode: EvalMode) -> 
CometResult<Option<i32>> {
+    do_cast_string_to_int::<i32>(str, eval_mode, "INT", i32::MIN)
+}
+
+fn cast_string_to_i64(str: &str, eval_mode: EvalMode) -> 
CometResult<Option<i64>> {
+    do_cast_string_to_int::<i64>(str, eval_mode, "BIGINT", i64::MIN)
+}

Review Comment:
   I pushed a commit to add some comments referencing the Spark code that this 
code is based on



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