Java DSL for Specifying Filter Conditions

When loading data from HPE Ezmeral Data Fabric Database as an Apache Spark RDD, you can use Java DSL to specify filter conditions. This section shows examples of these filter conditions.

Condition Example
equality 
QueryCondition equality = MapRDB.newCondition().is("_id", QueryCondition.Op.EQUAL, "k2").build();
greatherThan 
QueryCondition greatherThan = QueryCondition simpleWithComparisonOperator = MapRDB.newCondition().is("a.b.c", QueryCondition.Op.GREATER, 10).build();
notexists 
QueryCondition notexists = MapRDB.newCondition().notExists("a.c.e").build();
IN 
List<ODate> odateList = new ArrayList<>();
odateList.add(ODate.parse("2011-05-21"));
odateList.add(ODate.parse("2013-02-22"));
QueryCondition in = MapRDB.newCondition().in("a", odateList).build();
typeof 
QueryCondition typeOf = MapRDB.newCondition().typeOf("a.c.d", Value.Type.INT).build();
complex condition with and 
QueryCondition complexConditionWithAnd = MapRDB.newCondition()
.and()
.condition(MapRDB.newCondition().in("a", Arrays.asList(5, 10)))       
.condition(MapRDB.newCondition().notIn("b", Arrays.asList("aaa", "bbb")))       
.close().build();
another complex condition 
QueryCondition anotherComplexCondition = MapRDB.newCondition()
.and()       
.condition(MapRDB.newCondition().notExists("a.b"))       
.condition(MapRDB.newCondition().typeOf("p.q", Value.Type.DATE))   
.condition(MapRDB.newCondition().is("a.c.d", QueryCondition.Op.GREATER, 20L))   
.close().build();

The HPE Ezmeral Data Fabric Database OJAI Connector for Apache Spark supports these predicates:

  • is (LESS, LESS_OR_EQUAL, EQUAL, NOT_EQUAL, GREATER_OR_EQUAL, GREATER)
  • equals
  • and
  • exists
  • in
  • like
  • matches
  • notEquals
  • notExists
  • notIn
  • notLike
  • notMatches
  • notTypeOf
  • or
  • sizeOf
  • typeOf

Here are examples for these operators:

  • MapRDB.newCondition().is("a", QueryCondition.Op.GREATER, 10);
  • MapRDB.newCondition().is("a",QueryCondition.Op.GREATER_OR_EQUAL, 10);
  • MapRDB.newCondition().is("a", QueryCondition.Op.LESS, 10);
  • MapRDB.newCondition().is("a", QueryCondition.Op.LESS_OR_EQUAL, 10);
  • MapRDB.newCondition().is("a", QueryCondition.Op.EQUAL, 10);
  • MapRDB.newCondition().is("a", QueryCondition.Op.NOT_EQUAL, 10);
  • MapRDB.newCondition().exists("a");
  • MapRDB.newCondition().notIn("a", Arrays.asList(10, 20));
  • MapRDB.newCondition().in("a", Arrays.asList(10, 20));
  • MapRDB.newCondition().notExists("a");
  • MapRDB.newCondition().typeOf("a", Value.Type.INT);
  • MapRDB.newCondition().notTypeOf("a", Value.Type.INT);
  • MapRDB.newCondition().like("a", "%s");
  • MapRDB.newCondition().notLike("a", "%s");
  • MapRDB.newCondition().matches("a", "*s");
  • MapRDB.newCondition().notMatches("a", "*s");

For typeof, these are the right-hand side values:

  • "INT"
  • "INTEGER"
  • "LONG"
  • "BOOLEAN"
  • "STRING"
  • "SHORT"
  • "BYTE"
  • "NULL"
  • "FLOAT"
  • "DOUBLE"
  • "DECIMAL"
  • "DATE"
  • "TIME"
  • "TIMESTAMP"
  • "INTERVAL"
  • "BINARY"
  • "MAP"
  • "ARRAY"

The sizeOf operator can have the following operations:

  • MapRDB.newCondition().sizeOf("a", QueryCondition.Op.EQUAL, 10);
  • MapRDB.newCondition().sizeOf("a", QueryCondition.Op.LESS, 10);
  • MapRDB.newCondition().sizeOf("a", QueryCondition.Op.GREATER, 10);
  • MapRDB.newCondition().sizeOf("a", QueryCondition.Op.LESS_OR_EQUAL, 10);
  • MapRDB.newCondition().sizeOf("a", QueryCondition.Op.GREATER_OR_EQUAL, 10);
  • MapRDB.newCondition().sizeOf("a", QueryCondition.Op.NOT_EQUAL, 10);