Forward Xu created CALCITE-2985:
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Summary: Add the JSON_STORAGE_SIZE function
Key: CALCITE-2985
URL: https://issues.apache.org/jira/browse/CALCITE-2985
Project: Calcite
Issue Type: New Feature
Reporter: Forward Xu
JSON_STORAGE_SIZE(json_val)
This function returns the number of bytes used to store the binary
representation of a JSON document. When the argument is a JSON column, this is
the space used to store the JSON document. json_val must be a valid JSON
document or a string which can be parsed as one. In the case where it is
string, the function returns the amount of storage space in the JSON binary
representation that is created by parsing the string as JSON and converting it
to binary. It returns NULL if the argument is NULL.
An error results when json_val is not NULL, and is not—or cannot be
successfully parsed as—a JSON document.
To illustrate this function's behavior when used with a JSON column as its
argument, we create a table named jtable containing a JSON column jcol, insert
a JSON value into the table, then obtain the storage space used by this column
with JSON_STORAGE_SIZE(), as shown here:
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