wuchong commented on a change in pull request #11651:
[FLINK-16995][table-common] Add new data structure interfaces in table-common
URL: https://github.com/apache/flink/pull/11651#discussion_r406747759
##########
File path:
flink-table/flink-table-common/src/main/java/org/apache/flink/table/data/StringData.java
##########
@@ -23,43 +23,48 @@
import org.apache.flink.table.types.logical.VarCharType;
/**
- * {@link StringData} is an internal data structure represents data of {@link
VarCharType}
- * and {@link CharType} in Flink Table/SQL.
+ * An internal data structure representing data of {@link CharType} and {@link
VarCharType}.
+ *
+ * <p>This data structure is immutable.
Review comment:
BinaryStringData is mutable, because it is lazy (de)serialized. The binary
is lazily materialized when needed, so it's not thread-safe.
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