The DWT2D function has a required input table (or view) and an optional wavelet filter table. If you omit the wavelet filter table, you must specify the Wavelet argument.
The function assumes that each sequence fits into the memory of the worker. The following table describes the input table columns that you can or must specify with arguments. The table can have additional columns, but the function ignores them.
InputTable Schema
Column | Data Type | Description |
---|---|---|
partition_column | INTEGER, SMALLINT, BIGINT, NUMERIC, VARCHAR, VARBYTE(n), or BLOB | [Column appears once for each specified partition_column.] Identifier of sequence to which data belongs. Rows with same partition column values belong to same sequence. If table has multiple partition columns, function treats first one as distribution key of OutputTable and MetaInformationTable. |
indexy | INTEGER | Y index of sequence to which data belongs. If this column value is NULL, function ignores row. |
indexx | INTEGER | X index of sequence to which data belongs. If this column value is NULL, function ignores row. |
input_column | INTEGER, SMALLINT, BIGINT, DOUBLE PRECISION, or NUMERIC | Data to transform—numeric values between -1e308 and 1e308 (or NULL, which function treats as 0). |
WaveletFilterTable Schema
Same as WaveletFilterTable Schema in DWT Input.