Sets the HASH BY specification for a specified input stream.
Syntax
tdr.SetHashByDef( streamno, hashbydef )
Syntax Elements
- streamno
- Parameter type: integer
The input stream number.
- hashbydef
- Parameter type: list
A vector of column names.
Usage Notes
This function is valid only if called from the contract function.
The function must run on a PE-only node.
An error is raised in the following situations:
- The function is called from the table operator.
- The HASH BY metadata was already set.
Example: Set the HASH BY Specification for an Input Stream
The following statement sets the HASH BY metadata for input stream 0 with the specification that the columns in the HASH BY clause are col1 and col3.
hashbydef <- c("col1", "col3");
tdr.SetHashByDef( 0, hashbydef );