Loading JSON data to AWS Redshift results in NULL values

Question

I am trying to perform a load/copy operation to import data from JSON files in an S3 bucket directly to Redshift. The COPY operation succeeds, and after the COPY, the table

Answer 1

COPY maps the data elements in the JSON source data to the columns in the target table by matching object keys, or names, in the source name/value pairs to the names of columns in the target table. The matching is case-sensitive. Column names in Amazon Redshift tables are always lowercase, so when you use the ‘auto’ option, matching JSON field names must also be lowercase. If the JSON field name keys aren't all lowercase, you can use a JSONPaths file to explicitly map column names to JSON field name keys.

The solution would be to use jsonpath

Example json:

{
"Name": "Major",
"Age": 19,
"Add": {
"street":{
"st":"5 maint st",
"ci":"Dub"
},
"city":"Dublin"
},

"Category_Name": ["MLB","GBM"]

}

Example table:

(
name varchar,
age int,
address varchar,
catname varchar
);

Example jsonpath:

{
"jsonpaths": [
"$['Name']",
"$['Age']",
"$['Add']",
"$['Category_Name']"
]
}

Example copy code:

copy customer --redshift code
from 's3://mybucket/customer.json'
iam_role 'arn:aws:iam::0123456789012:role/MyRedshiftRole'
json from 's3://mybucket/jpath.json' ; -- Jsonpath file to map fields

Examples are taken from here