John Russell has posted comments on this change. ( http://gerrit.cloudera.org:8080/8942 )
Change subject: IMPALA-1767: [DOCS] Document new Boolean operators ...................................................................... Patch Set 3: (3 comments) http://gerrit.cloudera.org:8080/#/c/8942/3/docs/topics/impala_operators.xml File docs/topics/impala_operators.xml: http://gerrit.cloudera.org:8080/#/c/8942/3/docs/topics/impala_operators.xml@1245 PS3, Line 1245: In <keyword keyref="impala211_full"/> and higher, you can use : the operators <codeph>IS [NOT] TRUE</codeph> and : <codeph>IS [NOT] FALSE</codeph> to perform <q>null-safe</q> : tests against Boolean expressions. These operators always : return <codeph>TRUE</codeph> or <codeph>FALSE</codeph>, : even if the other side of the expression evaluates to : <codeph>NULL</codeph>. These operators let you simplify : Boolean comparisons that must also check for <codeph>NULL</codeph>, : for example <codeph>X != 10 AND X IS NOT NULL</codeph> is equivalent : to <codeph>(X != 10) IS TRUE</codeph>. : </p> > why is this explained here for IS UNKNOWN ? its a repeat of the content for Yes, I was looking for a place to explain all 3 of the new operators in context, but I think the results would look contrived. Since similar details and the example are under IS TRUE, let me remove the text here. http://gerrit.cloudera.org:8080/#/c/8942/3/docs/topics/impala_operators.xml@1260 PS3, Line 1260: IS [NOT] NULL > same thing twice. perhaps the first one should be IS [NOT] UNKNOWN ? Done http://gerrit.cloudera.org:8080/#/c/8942/3/docs/topics/impala_operators.xml@1332 PS3, Line 1332: UNKNOWN > TRUE ? (UNKNOWN is handled in the prev section) Done -- To view, visit http://gerrit.cloudera.org:8080/8942 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-MessageType: comment Gerrit-Change-Id: Iefebf210418ec2d47b154bd37166b76720f085bb Gerrit-Change-Number: 8942 Gerrit-PatchSet: 3 Gerrit-Owner: John Russell <jruss...@cloudera.com> Gerrit-Reviewer: Greg Rahn <gr...@cloudera.com> Gerrit-Reviewer: John Russell <jruss...@cloudera.com> Gerrit-Reviewer: Vuk Ercegovac <vercego...@cloudera.com> Gerrit-Comment-Date: Thu, 11 Jan 2018 04:36:34 +0000 Gerrit-HasComments: Yes
