NOT_NULL query condition on globalSecondaryIndex in dynamodb query -

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is possible add constraint dynamodb query expression states gsi should not null?

can provide examples.

is possible construct query 1 below?

new dynamodbqueryexpression<xxx>()             .withhashkeyvalues(yyy).withkeyconditionexpression(gsi != null);

note: please let me know if possible in during query , not during filter time?

the dynamodb string attribute can't have null or empty string.

when try insert null, api should throw below exception:-

java.lang.illegalargumentexception: input value must not null

when try insert empty string, api should throw below exception:-

com.amazonaws.amazonserviceexception: 1 or more parameter values invalid: attributevalue may not contain empty string

if want add additional filters on attributes (i.e. attributes other hash or range key), can use below syntax (i.e. withfilterexpression).

not equals operator "<>"

map<string, attributevalue> eav = new hashmap<string, attributevalue>(); eav.put(":val1", new attributevalue().withs("some value"));  dynamodbqueryexpression<xxx> queryexpression = new dynamodbqueryexpression<xxx>();     queryexpression.withhashkeyvalues(hashkeyvalues);            queryexpression.withfilterexpression("doctype <> :val1").withexpressionattributevalues(eav);

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