Arrow does have a Map type [1][2][3]. It is represented as a list of pairs.
François [1] https://github.com/apache/arrow/blob/762202418541e843923b8cae640d15b4952a0af6/format/Schema.fbs#L60-L87 [2] https://github.com/apache/arrow/blob/762202418541e843923b8cae640d15b4952a0af6/cpp/src/arrow/type.h#L691-L719 [3] https://github.com/apache/arrow/blob/762202418541e843923b8cae640d15b4952a0af6/java/vector/src/main/java/org/apache/arrow/vector/complex/MapVector.java#L36-L47 On Fri, Feb 7, 2020 at 3:55 AM Shawn Yang <shawn.ck.y...@gmail.com> wrote: > > Hi guys, > I'm writing an cross-language row-oriented serialization framework mainly > for java/python for now. I detained many data types and schema, field, such > as Byte, short, int, long, double, float, map, array, struct,. But then I > find using Arrow schema is a better choice. Since my framework need to > support conversion between my row-format and arrow columnar format. If I do > all it by myself, I need to support schema conversion and schema > serialization. Which is not necessary if I use arrow schema. > > But I find that arrow doesn't have a map data type, which is I needed > exactly. I know I can use struct to mock it or ExtensionType for it. But > it's not very convenient. So I want to know whether will Map type be > supported by arrow? > > Thanks. Regards
