tuple/sqlx/tuple_sketch_int64_agg_union.sqlx

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

config { hasOutput: true, tags: ["tuple", "udfs"] }

CREATE OR REPLACE AGGREGATE FUNCTION ${self()}(sketch BYTES)
RETURNS BYTES
OPTIONS (
  description = '''Builds a Tuple Sketch that represents the UNION of the given column of Tuple Sketches.
Note that cardinality estimation accuracy, plots, and error tables are the same as the Theta Sketch.
This function only applies to Tuple Sketches with an INT64 summary column.

Param sketch: the given column of Tuple Sketches with an INT64 summary column. This may not be NULL.
Defaults: lg_k = 12, seed = 9001, mode = SUM.
Returns: a Compact Tuple Sketch as BYTES. 

For more information:
 - https://datasketches.apache.org/docs/Tuple/TupleSketches.html
'''
) AS (
  ${ref("tuple_sketch_int64_agg_union_lgk_seed_mode")}(sketch, STRUCT<lg_k BYTEINT, seed INT64, mode STRING>(NULL, NULL, NULL))
);