Defining time dimension in Mondrain Schema? - postgresql

Question

I am trying to define time dimension in Mondrian schema. In Mondrian time dimension it require 3 level-type must be Years, Quarters, Months.
But my table contain only one date field. So how it is possible?
Can I use postgreSQL query in Mondrian? So I can use 3 query to select Years, Quarters and Month from single date field.

Answer 1

Create simple table with only one date column:
create table tmp_cube as (select generate_series('2011-01-01'::date, '2012-01-01'::date, '1 day')::date gs);
Create dummy cube:
<Schema name="New Schema1">
<Cube name="Test" visible="true" cache="true" enabled="true">
<Table name="tmp_cube" schema="public" alias="">
</Table>
<Dimension type="TimeDimension" visible="true" foreignKey="gs" name="Time Dimension">
<Hierarchy name="New Hierarchy 0" visible="true" hasAll="true" primaryKey="gs">
<View alias="test_view">
<SQL dialect="generic">SELECT gs, extract(year from gs) as year, extract(quarter from gs) as quarter, extract(month from gs) as month FROM tmp_cube</SQL>
</View>
<Level name="Year" visible="true" column="year" type="Integer" internalType="int" uniqueMembers="false" levelType="TimeYears">
</Level>
<Level name="Quarter" visible="true" column="quarter" type="Integer" uniqueMembers="false" levelType="TimeQuarters">
</Level>
<Level name="Month" visible="true" column="month" type="Integer" uniqueMembers="false" levelType="TimeMonths">
</Level>
</Hierarchy>
</Dimension>
<Measure name="Count Rows" column="gs" aggregator="count" visible="true">
</Measure>
</Cube>
</Schema>
Now I see in Saiku: