[ https://issues.apache.org/jira/browse/ARROW-3891?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Antoine Pitrou updated ARROW-3891: ---------------------------------- Component/s: Java > [Java] Remove Long.bitCount with simple bitmap operations > --------------------------------------------------------- > > Key: ARROW-3891 > URL: https://issues.apache.org/jira/browse/ARROW-3891 > Project: Apache Arrow > Issue Type: Sub-task > Components: Java > Reporter: Animesh Trivedi > Assignee: Animesh Trivedi > Priority: Major > Labels: pull-request-available > Fix For: 0.12.0 > > Time Spent: 50m > Remaining Estimate: 0h > > the `public int isSet(int index)` routine checks if the bit is set by calling > Long.bitCount function. This is unnecessary and creates performance > degradation. This can simply be replaced by bit shift and bitwise & > operation. > `return Long.bitCount(b & (1L << bitIndex));` > to > `return (b >> bitIndex) & 0x01;` -- This message was sent by Atlassian JIRA (v7.6.3#76005)