We don't have a lot of in-depth documentation, partly because the implementation details change frequently.
Have you read the Impala paper? http://cidrdb.org/cidr2015/Papers/CIDR15_Paper28.pdf (here's a summary: https://blog.acolyer.org/2015/02/05/impala-a-modern-open-source-sql-engine-for-hadoop/ ) There's also an old paper on code generation: https://pdfs.semanticscholar.org/bac4/169d6b6f713c76271b5ccf3d45293351f785.pdf But the very best thing to read is the source code... On 2 August 2017 at 09:59, 俊杰陈 <cjjnj...@gmail.com> wrote: > Hi > > I’m learning impala code now, is there anyone has any impala doc/PPT for > computing workflow (such as order by), vectorization, and codegen? Thanks > in advanced. > > -- > Thanks & Best Regards >
