Merge pull request #4701 from sundy-li/null-take

query(values): support take for null column && update streaming load docs

common/datavalues/src/columns/take.rs

@@ -23,7 +23,7 @@ use crate::prelude::*;
 
 impl Series {
     pub fn take<I: Index>(column: &ColumnRef, indices: &[I]) -> Result<ColumnRef> {
-        if column.is_const() {
+        if column.is_const() || column.is_null() {
             Ok(column.slice(0, indices.len()))
         } else if column.is_nullable() {
             let nullable_c: &NullableColumn = unsafe { Series::static_cast(column) };

docs/doc/21-load-data/00-local.md

@@ -12,6 +12,8 @@ description:
 Using HTTP API `v1/streaming_load` to load data from local file into Databend.
 Currently, we only support CSV and Parquet file format.
 
+> Note: CSV file should be UTF-8 character encoded if you have extra character set
+
 ### Before You Begin
 
 * **Databend :** Make sure Databend is running and accessible, see [How to deploy Databend](/doc/deploy).

tests/suites/0_stateless/01_system/01_0000_system_numbers.result

@@ -20,3 +20,6 @@
 1
 2.5
 2
+2	NULL
+1	NULL
+0	NULL

tests/suites/0_stateless/01_system/01_0000_system_numbers.sql

@@ -12,15 +12,19 @@ SELECT argMax(a, b) from (select number + 5 as a, number - 5 as b from numbers_m
 SELECT argMax(b, a) from (select number + 5 as a, number - 5 as b from numbers_mt(10000));
 
 -- test argMax, argMin fro String
- SELECT argMax(a, b) from (select number + 5 as a, cast(number as varchar(255)) as b from numbers_mt(10000)) ;
- SELECT argMax(b, a) from (select number + 5 as a, cast(number as varchar(255)) as b from numbers_mt(10000)) ;
+SELECT argMax(a, b) from (select number + 5 as a, cast(number as varchar(255)) as b from numbers_mt(10000)) ;
+SELECT argMax(b, a) from (select number + 5 as a, cast(number as varchar(255)) as b from numbers_mt(10000)) ;
 
 
- select count(distinct number, number + 1 , number + 3 ) from ( select number % 100 as number from numbers(100000));
- select count(distinct 3) from numbers(10000);
- select uniq(number, number + 1 , number + 3 )  =  count(distinct number, number + 1 , number + 3 ) from ( select number % 100 as number from numbers(100000));
- SELECT std(number) between  2886.751 and 2886.752 from numbers_mt(10000);
- SELECT stddev(number) between  2886.751 and 2886.752 from numbers_mt(10000);
- SELECT stddev_pop(number) between  2886.751 and 2886.752 from numbers_mt(10000);
- SELECT covar_samp(number, number) from (select * from numbers_mt(5) order by number asc);
- SELECT covar_pop(number, number) from (select * from numbers_mt(5) order by number asc);
+select count(distinct number, number + 1 , number + 3 ) from ( select number % 100 as number from numbers(100000));
+select count(distinct 3) from numbers(10000);
+select uniq(number, number + 1 , number + 3 )  =  count(distinct number, number + 1 , number + 3 ) from ( select number % 100 as number from numbers(100000));
+SELECT std(number) between  2886.751 and 2886.752 from numbers_mt(10000);
+SELECT stddev(number) between  2886.751 and 2886.752 from numbers_mt(10000);
+SELECT stddev_pop(number) between  2886.751 and 2886.752 from numbers_mt(10000);
+SELECT covar_samp(number, number) from (select * from numbers_mt(5) order by number asc);
+SELECT covar_pop(number, number) from (select * from numbers_mt(5) order by number asc);
+
+
+-- sort with null
+SELECT number, null from numbers(3) order by number desc;