Calcite has not implemented the syntax in that paper. I would support an effort to add it (unsurprising, since I am a co-author of that paper).
EMIT STREAM is equivalent to the current SELECT STREAM syntax. There is no equivalent in current Calcite of the EMIT AFTER WATERMARK, or EMIT STREAM AFTER DELAY. HOP, TUMBLE and SESSION are supported in Calcite’s SQL parser, but following the paper would be replaced with a table function call. We could need to add HOP, TUMBLE and SESSION table functions. We would also need to make the system aware of how watermarks flow through these table functions (an area that the paper does not go into). Julian > On Aug 19, 2019, at 6:59 PM, Rui Wang <ruw...@google.com.INVALID> wrote: > > Hi Calcite community, > > I have seen [1] is published, which proposes TVF style TUMBLE/HOP/SESSION > windowing and EMIT syntax for materialization control. > > I tried to search dev@calcite and Calcite JIRA but didn't find those > support above. So is Calcite already support TVF windowing and EMIT syntax > somehow, or it's a future work? > > > > [1]: https://arxiv.org/pdf/1905.12133.pdf > > > -Rui
