[HIVE-24194] Query with column mask fail with ParseException if column name has special char

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 3.1.2
• Component/s: Hive
• Assignee: Unassigned
• Reporter: Rajkumar Singh
• Created: 23/Sep/20 23:58
• Updated: 23/Sep/20 23:58

Description

hive query with column masking failed with ParseException

Table DDL

CREATE TABLE `emp`( `id` string, `name#` string);

The following query failed

select `emp`.`id`, `emp`.`name#` from (SELECT `id`, CAST(mask_show_first_n(name#, 4, 'x', 'x', 'x', -1, '1') AS string) AS `name#`, BLOCK__OFFSET__INSIDE__FILE, INPUT__FILE__NAME, ROW__ID FROM `default`.`emp` )`emp`;

Error: Error while compiling statement: FAILED: ParseException line 1:79 character '#' not supported here (state=42000,code=40000)

quoting manually helped

select `emp`.`id`, `emp`.`name#` from (SELECT `id`, CAST(mask_show_first_n(`name#`, 4, 'x', 'x', 'x', -1, '1') AS string) AS `name#`, BLOCK__OFFSET__INSIDE__FILE, INPUT__FILE__NAME, ROW__ID FROM `default`.`emp` )`emp`;

manual query change will not work for Ranger authorizer as following query

select * from emp;

will be rewritten to

select `emp`.`id`, `emp`.`name#` from (SELECT `id`, CAST(mask_show_first_n(name#, 4, 'x', 'x', 'x', -1, '1') AS string) AS `name#`, BLOCK__OFFSET__INSIDE__FILE, INPUT__FILE__NAME, ROW__ID FROM `default`.`emp` )`emp`;

Ranger apply the transformer for column here so we should consider the enclosing the column names in the back-ticks to make it work

https://github.com/apache/ranger/blob/master/hive-agent/src/main/java/org/apache/ranger/authorization/hive/authorizer/RangerHiveAuthorizer.java#L1332

I have opened https://issues.apache.org/jira/browse/RANGER-3009 for Ranger but checking we hive can pass the column name enclosed in back-ticks while passing the priv-object to ranger

https://github.com/apache/hive/blob/7dd12cd9d77aaaa20f22159062d3c3e5d7bdd127/ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java#L11977