You can load already existing parquet files to the destination table from another location in HDFS.
On 12 October 2017 at 18:44, sky <x_h...@163.com> wrote: > From the impala document, parquet supports load data operation, and how does > it support ? > > > > > > > > > At 2017-10-13 00:30:12, "Jeszy" <jes...@gmail.com> wrote: >>See the docs on LOAD DATA: >>http://impala.apache.org/docs/build/html/topics/impala_load_data.html >> >>"In the interest of speed, only limited error checking is done. If the >>loaded files have the wrong file format, different columns than the >>destination table, or other kind of mismatch, Impala does not raise >>any error for the LOAD DATA statement. Querying the table afterward >>could produce a runtime error or unexpected results. Currently, the >>only checking the LOAD DATA statement does is to avoid mixing together >>uncompressed and LZO-compressed text files in the same table." >> >>To reload CSV data as parquet using Impala, you'd have to create a >>table for the CSV data, then do an 'insert into [parquet table] select >>[...] from [csv_table]'. >> >>HTH >> >>On 12 October 2017 at 07:58, sky <x_h...@163.com> wrote: >>> Hi all, >>> How does the parquet table perform load data operations? How does a CSV >>> file import into the parquet table?
