Correct span function type routing (allow any)

Signed-off-by: Yuanchun Shen <yuanchu@amazon.com>

Author: yuancu

core/src/main/java/org/opensearch/sql/expression/function/udf/SpanFunction.java

@@ -18,10 +18,10 @@
 import org.apache.calcite.rel.type.RelDataType;
 import org.apache.calcite.rex.RexCall;
 import org.apache.calcite.schema.impl.ScalarFunctionImpl;
-import org.apache.calcite.sql.type.CompositeOperandTypeChecker;
 import org.apache.calcite.sql.type.OperandTypes;
 import org.apache.calcite.sql.type.SqlReturnTypeInference;
 import org.apache.calcite.sql.type.SqlTypeFamily;
+import org.apache.calcite.sql.type.SqlTypeName;
 import org.apache.calcite.sql.type.SqlTypeUtil;
 import org.apache.calcite.util.BuiltInMethod;
 import org.opensearch.sql.calcite.type.ExprSqlType;
@@ -59,15 +59,13 @@ public SqlReturnTypeInference getReturnTypeInference() {
   @Override
   public UDFOperandMetadata getOperandMetadata() {
     return UDFOperandMetadata.wrap(
-        (CompositeOperandTypeChecker)
-            OperandTypes.family(
-                    SqlTypeFamily.CHARACTER, SqlTypeFamily.NUMERIC, SqlTypeFamily.CHARACTER)
-                .or(
-                    OperandTypes.family(
-                        SqlTypeFamily.DATETIME, SqlTypeFamily.NUMERIC, SqlTypeFamily.CHARACTER))
-                .or(
-                    OperandTypes.family(
-                        SqlTypeFamily.NUMERIC, SqlTypeFamily.NUMERIC, SqlTypeFamily.ANY)));
+        OperandTypes.family(SqlTypeFamily.CHARACTER, SqlTypeFamily.NUMERIC, SqlTypeFamily.CHARACTER)
+            .or(
+                OperandTypes.family(
+                    SqlTypeFamily.DATETIME, SqlTypeFamily.NUMERIC, SqlTypeFamily.CHARACTER))
+            .or(
+                OperandTypes.family(
+                    SqlTypeFamily.NUMERIC, SqlTypeFamily.NUMERIC, SqlTypeFamily.ANY)));
   }
 
   public static class SpanImplementor implements NotNullImplementor {
@@ -86,7 +84,7 @@ public Expression implement(
       if (SqlTypeUtil.isDecimal(intervalType)) {
         interval = Expressions.call(interval, "doubleValue");
       }
-      if (SqlTypeUtil.isNull(unitType)) {
+      if (SqlTypeUtil.isNull(unitType) || SqlTypeName.ANY.equals(unitType.getSqlTypeName())) {
         return switch (call.getType().getSqlTypeName()) {
           case BIGINT, INTEGER, SMALLINT, TINYINT ->
               Expressions.multiply(Expressions.divide(field, interval), interval);