Unable to do full text search on vector of references about groonga HOT 2 CLOSED

table_create ReportTags TABLE_HASH_KEY ShortText
# For full text search.
table_create ReportTagsIndex TABLE_PAT_KEY ShortText --default_tokenizer TokenBigram --normalizer NormalizerAuto
# Text data exists in ReportTags._key. So --source of
# ReportTagsIndex.index_tags is "_key". We don't need WITH_SECTION
# because ReportTags._key is a scalar value.
column_create ReportTagsIndex index_tags COLUMN_INDEX|WITH_POSITION --type ReportTags --source _key

table_create Reports TABLE_HASH_KEY ShortText
column_create Reports tags COLUMN_VECTOR ReportTags

# For exact match. We add an index column to ReportTags.
# We don't need to create a new table for exact match
# against reference column.
# (Reports.tags's type is a table (ReportTags).)
# We don't need WITH_POSITION because this is
# not for a full text search. We don't need WITH_SECTION too because
# we don't need to care about offset in "Reports.tags" for exact match.
column_create ReportTags index_report COLUMN_INDEX Reports tags

load --table Reports
[
{"_key":"1","tags":["All News","sanctions","State-Sponsored","Hacktivist","South Korea","Maritime"]}
]

# You can see which index column is used by "select" in groonga.log.
# log_level debug

# Full text search. "._key" is important. ReportTagsIndex.index_tags
# is used.
select Reports --query tags._key:@korea

# Exact match. ReportTags.index_report is used.
select Reports --query tags:@sanctions