Subbarao created CALCITE-2371:
---------------------------------
Summary: how to perform joins in mongodb using model json in
calcite
Key: CALCITE-2371
URL: https://issues.apache.org/jira/browse/CALCITE-2371
Project: Calcite
Issue Type: Task
Reporter: Subbarao
Assignee: Julian Hyde
Hi,
Iam already connected mongodb using json model file in apache calcite.
but here while executing select * from "tablename" it will be showing
exceptions.
instead of that query iam using select _MAP['columnname'] from 'tablename'
then it will be perfectly executing .But i need to select all the columns what
is the query.
Another one is i try to perform sql joins in mongodb but it will be not
working.how to acheive this task.
{
"version": "1.0",
"defaultSchema": "MONGODATABASE",
"schemas": [
{
"type": "custom",
"name": "MONGODATABASE",
"factory": "org.apache.calcite.adapter.mongodb.MongoSchemaFactory",
"operand": {
"host": "loaclhost",
"database": "db"
}
}
]
}
java.calss file:
Connection connection = DriverManager.getConnection(
"jdbc:calcite:model=/home/msubbarao/samplefile2/CalciteWithMongoDb/calcitewithmongo.json",
info);
Statement stat = connection.createStatement();
String sql="select * from table1 c JOIN table2 s on c.name=s.name";
String sql1="selecT cast(_MAP['columnname'] AS INTEGER(20)) from
\"table\" c ";
ResultSet rs = stat.executeQuery(sql);
while(rs.next()){
System.out.println("-->"+rs.getString(1));
}
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