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discord9
abedeb2bea
* fix(query): keep count_values generated label in enclosing expressions
`count_values("v", m)` projects the generated label as a real output
column, but did not register it in `ctx.tag_columns`. Enclosing
expressions (abs/round/+1/topk/label_replace/vector join) rebuild their
projection from `ctx.tag_columns` and silently drop the label.
Register the generated label in `ctx.tag_columns` after the projection,
and give it the same qualifier as other tag columns so qualified
references resolve. PromQL overwrites an input label with the same name,
so drop any existing tag with that name first to avoid duplicate column
ambiguity.
Fixes https://github.com/GreptimeTeam/greptimedb/issues/9181
Report: .e-agent/greptimedb_promql_compatibility_report_2026-09-16.md P0-1
Signed-off-by: discord9 <55937128+discord9@users.noreply.github.com>
* fix(query): use total_cmp in count_values test helper
Silence clippy::needless_borrow on partial_cmp(&right.1); f64 sorting
uses total_cmp, matching the other planner test helpers.
Signed-off-by: discord9 <55937128+discord9@users.noreply.github.com>
* fix(flow): keep count_values generated label as sink table primary key
FindGroupByFinalName::f_up only renamed a group key when the projection
aliased the key column directly. count_values now projects its generated
label as a unary UDF over the sampled column
(prom_float_to_string(value) AS label) while the aggregate still groups
by the raw column, so the name match failed and the sink table lost the
label from its PRIMARY KEY, demoting it to a DOUBLE value column.
Allow a projection above the aggregate to rename a group key by deriving
its output from a single group-key column (unary scalar function or cast
over that column only). Multi-column expressions, case, aggregates,
windows, subqueries and literals are still rejected so a computed column
cannot be mistaken for the group key.
Signed-off-by: discord9 <55937128+discord9@users.noreply.github.com>
* fix(query): group count_values by the formatted sample value
The numeric count_values branch grouped by the raw sample column and only
formatted the value into the generated label in the post-aggregate
projection. Two distinct raw values that collapse to one label text
(e.g. BIGINT 9007199254740992 and 9007199254740993, both 9007199254740992
in Float64) were split into two groups, each emitting the same label set
at one timestamp, violating Prometheus' unique-label-set-per-timestamp
invariant.
Return the formatted value expression (prom_float_to_string, with a
CAST to Float64 for non-Float64 inputs) as previous_field_expressions so
the aggregate groups by the same expression that produces the label,
mirroring the existing mixed float/native-histogram precedent.
Signed-off-by: discord9 <55937128+discord9@users.noreply.github.com>
* fix(query): drop needless borrow in count_values test helper
Signed-off-by: discord9 <55937128+discord9@users.noreply.github.com>
* fix(flow): don't replace group key with derived unary expr
FindGroupByFinalName treated any unary expression of a single group
column (scalar fn, Cast, TryCast) as a rename of that group key and
swapped it in as the sink primary key. A derived expression such as
lower(host) is many-to-one, so distinct groups (HOST_A vs host_a) would
collapse to the same primary key and be silently deduplicated.
Narrow the matching to direct name-matched aliases of the actual group
expression only, and drop the derived-unary path (is_unary_expr_of_column)
and the allow_derived flag. count_values already groups by the formatted
expression name, so it is unaffected.
Add a regression asserting host survives and host_lc does not replace it
under both optimizer settings.
Signed-off-by: discord9 <55937128+discord9@users.noreply.github.com>
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Signed-off-by: discord9 <55937128+discord9@users.noreply.github.com>