JSON Blob syntax fails when including a typecast or || concat in Snowflake

[seve-martinez]

This is actually two bugs, but are very closely related.

Fully reproducible code snippet
Please include a fully reproducible code snippet or the input sql, dialect, and expected output.

First issue

from sqlglot import parse_one, exp
from sqlglot.dialects import Snowflake
from sqlglot.optimizer import build_scope, find_all_in_scope
from sqlglot.optimizer.qualify import qualify


qry = """
  with a as (
    select '{"from": 12345, "to": 67890}' as json_blob
  )
  
  -- or ::INTEGER
  select try_parse_json(json_blob):from::STRING from a
"""

ast = parse_one(qry, dialect=Snowflake)
q_ast = qualify(ast, dialect=Snowflake)

root = build_scope(q_ast)

for scope in root.traverse():
    for column in set(scope.columns):
        print(column)

Produces

ParseError: Invalid expression / Unexpected token. Line 6, Col: 41.
     select '{"from": 12345, "to": 67890}' as json_blob
  )

  select try_parse_json(json_blob):from::STRING from a

Alternatively:

Invalid JSON path syntax. Unexpected TokenType.L_PAREN at index 1: CAST(from AS TEXT)

Second issue

The other example uses the following query:

ParseError: Invalid expression / Unexpected token. Line 6, Col: 42.
    select '{"from": 12345, "to": 67890}' as json_blob
  )

  -- NOTE: The space preceding the `||` is optional
  select try_parse_json(json_blob):from || ' test' from a

Will fail with:

Unexpected TokenType.STRING at index 2: from || ' test '

Official Documentation
Please include links to official SQL documentation related to your issue.