[HIVE-13625] Hive Prepared Statement when executed with escape characters in parameter fails

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.3.0
• Component/s: JDBC
• Assignee: Zoltan Haindrich
• Reporter: Daya Venkatesan
• Created: 27/Apr/16 06:14
• Updated: 13/Dec/17 09:21
• Resolved: 11/Jul/16 05:33

Description

When setting parameters to a Hive Prepared Statement, if the parameter has an odd number of escape characters, then the Statement fails.

For example, I set one of the parameters to "/somepath/\044

{yyyy}

/\044

{MM}

/\044

{dd}

/". Here, I have escaped the dollar character with \044 because Hive gives an Atlas exception with "$" character.
Now, when the parameters are getting set inside Hive, getCharIndexFromSqlByParamLocation throws an Exception.
Hive records something called signal count.

if (c == '\'' || c == '
')// record the count of char "'" and char "\"

{ signalCount++; }

And the parameter is set only if the signalCount %2 is 0.

else if (c == cchar && signalCount % 2 == 0) {// check if the ? is really the parameter
num++;
if (num == paramLoc)

{ charIndex = i; break; }

Since my parameter has three "\" characters, the signal Count modulo is not 0 and the parameter is not set at all throwing an exception.

Issue Links

• Blocked: HIVE-18268 Hive Prepared Statement when split with double quoted in query fails