Presto Map Agg at Scott Ferro blog

Presto Map Agg. For the my_map cte, use map_agg. If there is an aggregation function, the worker must remember the current aggregation data. The amount of data stored depends on the. Returns a map containing the count of the number of times each input value occurs. See also map_agg() and multimap_agg() for creating a map as an aggregation. See also map_agg() and multimap_agg() for creating a map as an aggregation. Map_agg ( key , value ) → map<<strong>k</strong>,v> returns a map created from the. For the rest, i think you just want to attach the map to every row of second_table , so you can use it as a lookup. Map_agg ( key , value ) → map<<strong>k</strong>,v> returns a map created from the. Returns a map containing the count of the number of times each input value occurs. Map_concat ( x , y ).</p> Returns all the values in the map x. See also map_agg() and multimap_agg() for creating a map as an aggregation.

深入理解Presto中的Group By查询 知乎
from zhuanlan.zhihu.com

The amount of data stored depends on the. For the rest, i think you just want to attach the map to every row of second_table , so you can use it as a lookup. See also map_agg() and multimap_agg() for creating a map as an aggregation. For the my_map cte, use map_agg. Map_agg ( key , value ) → map<<strong>k</strong>,v> returns a map created from the. Map_concat ( x , y ).</p> Returns all the values in the map x. See also map_agg() and multimap_agg() for creating a map as an aggregation. Map_agg ( key , value ) → map<<strong>k</strong>,v> returns a map created from the. If there is an aggregation function, the worker must remember the current aggregation data.

深入理解Presto中的Group By查询 知乎

Presto Map Agg Returns a map containing the count of the number of times each input value occurs. Map_concat ( x , y ).</p> For the rest, i think you just want to attach the map to every row of second_table , so you can use it as a lookup. For the my_map cte, use map_agg. Map_agg ( key , value ) → map<<strong>k</strong>,v> returns a map created from the. See also map_agg() and multimap_agg() for creating a map as an aggregation. If there is an aggregation function, the worker must remember the current aggregation data. Returns a map containing the count of the number of times each input value occurs. Returns all the values in the map x. See also map_agg() and multimap_agg() for creating a map as an aggregation. Map_agg ( key , value ) → map<<strong>k</strong>,v> returns a map created from the. The amount of data stored depends on the. Returns a map containing the count of the number of times each input value occurs. See also map_agg() and multimap_agg() for creating a map as an aggregation.

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