xdcjie created SPARK-24339:
------------------------------
Summary: spark sql can not prune column in transform/map/reduce
query
Key: SPARK-24339
URL: https://issues.apache.org/jira/browse/SPARK-24339
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.2.1, 2.2.0, 2.1.2, 2.1.1
Reporter: xdcjie
Fix For: 2.2.1, 2.2.0, 2.1.2, 2.1.1
I was using {{TRANSFORM USING}} with branch-2.1/2.2, and noticed that it will
scan all column of data, query like:
{code:java}
SELECT TRANSFORM(usid, cch) USING 'python test.py' AS (u1, c1, u2, c2) FROM
test_table;{code}
it's physical plan like:
{code:java}
== Physical Plan ==
ScriptTransformation [usid#17, cch#9], python test.py, [u1#784, c1#785, u2#786,
c2#787],
HiveScriptIOSchema(List(),List(),Some(org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe),Some(org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe),List((field.delim,
)),List((field.delim,
)),Some(org.apache.hadoop.hive.ql.exec.TextRecordReader),Some(org.apache.hadoop.hive.ql.exec.TextRecordWriter),false)
+- FileScan parquet
[sh#0L,clk#1L,chg#2L,qey#3,ship#4,chgname#5,sid#6,bid#7,dis#8L,cch#9,wch#10,wid#11L,arank#12L,rtag#13,iid#14,uid#15,pid#16,usid#17,wdid#18,bid#19,oqleft#20,oqright#21,poqvalue#22,tm#23,...
367 more fields] Batched: false, Format: Parquet, Location:
InMemoryFileIndex[file:/Users/Downloads/part-r-00093-0ef5d59f-2e08-4085-9b46-458a1652932a.g...,
PartitionFilters: [], PushedFilters: [], ReadSchema:
struct<sh:bigint,clk:bigint,chg:bigint,qey:string,ship:string,chgname:string,s...
{code}
In our scenario, parquet has 400 column, this query will take more time.
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