async *transform(source) {
Yetanotherbadsalmon，更多细节参见爱思助手下载最新版本
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Importing packages... done
ON products USING GIN ((data-'tags')) - extracts value by 'tags' key as JSON(B) and uses GIN to index it, since it is a composite type; it allows using various containment and existence operators for this particular part of the JSON document