ColumnVector Contract — In-Memory Columnar Data

Table 1. ColumnVector Contract (Abstract Methods Only)
Method	Description
`getArray`	`ColumnarArray getArray(int rowId)` Used when…FIXME
`getBinary`	`byte[] getBinary(int rowId)` Used when…FIXME
`getBoolean`	`boolean getBoolean(int rowId)` Used when…FIXME
`getByte`	`byte getByte(int rowId)` Used when…FIXME
`getChild`	`ColumnVector getChild(int ordinal)` Used when…FIXME
`getDecimal`	`Decimal getDecimal( int rowId, int precision, int scale)` Used when…FIXME
`getDouble`	`double getDouble(int rowId)` Used when…FIXME
`getFloat`	`float getFloat(int rowId)` Used when…FIXME
`getInt`	`int getInt(int rowId)` Used when…FIXME
`getLong`	`long getLong(int rowId)` Used when…FIXME
`getMap`	`ColumnarMap getMap(int ordinal)` Used when…FIXME
`getShort`	`short getShort(int rowId)` Used when…FIXME
`getUTF8String`	`UTF8String getUTF8String(int rowId)` Used when…FIXME
`hasNull`	`boolean hasNull()` Used when OffHeapColumnVector and OnHeapColumnVector are requested to `putNotNulls`
`isNullAt`	`boolean isNullAt(int rowId)` Used in many places
`numNulls`	`int numNulls()` Used for testing purposes only

Table 2. ColumnVectors (Direct Implementations and Extensions)
ColumnVector	Description
`ArrowColumnVector`
`OrcColumnVector`
WritableColumnVector	Writable column vectors with off-heap and on-heap memory variants

ColumnVector takes a DataType of the column to be created.

Note	`ColumnVector` is a Java abstract class and cannot be created directly. It is created indirectly for the concrete ColumnVectors.

Note	`ColumnVector` is an `Evolving` contract that is evolving towards becoming a stable API, but is not a stable API yet and can change from one feature release to another release. In other words, using the contract is as treading on thin ice.

CalendarInterval getInterval(int rowId)

getInterval…FIXME

Note	`getInterval` is used when…FIXME

ColumnarRow getStruct(int rowId)

getStruct…FIXME

Note	`getStruct` is used when…FIXME

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