[SPARK-29634] spark-sql can't query hive table values with schema Char by equality.

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Incomplete
• Affects Version/s: 2.2.1, 2.3.1
• Component/s: Spark Shell, SQL
• Labels: bulk-closed spark-sql spark-sql-perf

Environment

Spark 2.3.1

Hive 3.0.0

TPCDS Data & Tables

• Assignee: Unassigned
• Reporter: Zhaoyang Qin
• Created: 29/Oct/19 08:50
• Updated: 25/May/21 01:51
• Resolved: 25/May/21 01:38

Description

spark-sql can't query hive table values  with char schema by equality.

When i use spark-sql CLI  to execute a query with hive tables,The expected results can not be obtained. The query result is empty. Some equality conditions did not work as expected.I checked and found that the table fields had one thing in common: they were created as char，sometimes as varchar.Then I execute the following statement and return an empty result: select * from foo where bar = 'something'.In fact, the data does exist. Using hive sql returns the correct results.

Simulation steps:（use spark-sql）

//spark-sql

./spark-sql 

> create table test1 (name char(10), age int);

> insert into test1 values('erya',15);

> select * from test1 where name = 'erya';  // no results

> select * from test1 where name = 'erya      ';  // add 6 spaces