Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/4612#discussion_r138918828
--- Diff:
flink-core/src/main/java/org/apache/flink/api/common/typeinfo/Types.java ---
@@ -19,56 +19,408 @@
package org.apache.flink.api.common.typeinfo;
import org.apache.flink.annotation.PublicEvolving;
+import org.apache.flink.api.common.functions.InvalidTypesException;
+import org.apache.flink.api.java.typeutils.EitherTypeInfo;
+import org.apache.flink.api.java.typeutils.EnumTypeInfo;
+import org.apache.flink.api.java.typeutils.GenericTypeInfo;
+import org.apache.flink.api.java.typeutils.ListTypeInfo;
+import org.apache.flink.api.java.typeutils.MapTypeInfo;
+import org.apache.flink.api.java.typeutils.ObjectArrayTypeInfo;
+import org.apache.flink.api.java.typeutils.PojoField;
+import org.apache.flink.api.java.typeutils.PojoTypeInfo;
import org.apache.flink.api.java.typeutils.RowTypeInfo;
+import org.apache.flink.api.java.typeutils.TupleTypeInfo;
+import org.apache.flink.api.java.typeutils.TypeExtractor;
+import org.apache.flink.api.java.typeutils.ValueTypeInfo;
-import java.math.BigDecimal;
-import java.sql.Date;
-import java.sql.Time;
-import java.sql.Timestamp;
+import java.lang.reflect.Field;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
/**
- * This class gives access to the type information of the most most common
types.
+ * This class gives access to the type information of the most common
types for which Flink
+ * has built-in serializers and comparators.
+ *
+ * <p>In many cases, Flink tries to analyze generic signatures of
functions to determine return
+ * types automatically. This class is intended for cases where the
extraction is not possible
+ * (or inefficient) as well as cases where type information has to be
supplied manually.
--- End diff --
`(or would result in an inefficient type)`?
---
