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feat(sql): typed datetime literals (TIMESTAMP, TIMESTAMP_LTZ, TIMESTAMP_NTZ, DATE) resolved in the analyzer - #183
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Spark accepts TIMESTAMP '...', TIMESTAMP_LTZ '...', TIMESTAMP_NTZ '...' and DATE '...' typed literals. Krishiv parsed them but rejected the TIMESTAMP forms when lowering, forcing workarounds with CAST instead. Parsing stays in the existing literal grammar. Lowering now evaluates timestamp literals once at analysis time through the same CAST string-to-timestamp kernels execution uses, so parsing rules match CAST. Plain TIMESTAMP follows spark.sql.timestampType (without a zone it is TIMESTAMP_NTZ, with a zone it stays an instant) and instants without a zone read spark.sql.session.timeZone. The result is a constant Literal, never a per-row cast. Malformed text fails with INVALID_TYPED_LITERAL at the literal span; clock-dependent spellings (now, today, bare times) and region zones needing the tz database stay KRISHIV_UNSUPPORTED_FEATURE, as the kernels report. Output names now render timestamp literals as Spark does (TIMESTAMP '...' / TIMESTAMP_NTZ '...'). Unverified: region-zone session rows against the goldens (the engine has no tz database, as for CASTs); TIME and INTERVAL typed forms remain unsupported, as the IR has no such types. Signed-off-by: gopal tathe <44522021+techgopal@users.noreply.github.com>
Parser produces an unresolved TypedLiteral node only (type keyword plus raw string); no evaluation, no time zone and no ParserOptions or fingerprint changes there. The analyzer lowers DATE, TIMESTAMP, TIMESTAMP_NTZ and TIMESTAMP_LTZ to a constant Literal with the string-to-date/timestamp cast kernels and the session-resolved zone (spark.sql.session.timeZone, default UTC when unset, the same default the cast path uses) and timestamp type (spark.sql.timestampType decides plain TIMESTAMP, with an explicit zone in the value staying an instant). Zone detection uses the kernel parse result via timestamp_has_zone, not double casting. Clock-dependent spellings and region zones stay KRISHIV_UNSUPPORTED_FEATURE; malformed text is INVALID_TYPED_LITERAL with the literal position. Output names use the cast-to-string kernels in the session zone; the hand-written UTC formatter is removed. Signed-off-by: gopal tathe <44522021+techgopal@users.noreply.github.com>
The analyzer and the expression evaluator each carried a copy of the fixed-offset zone parser. Both now use FixedOffset::parse next to the zone type in the cast kernels, so typed literals and casts read spark.sql.session.timeZone the same way. Signed-off-by: gopal tathe <44522021+techgopal@users.noreply.github.com>
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| Layer / File(s) | Summary |
|---|---|
Fixed-offset parsing and session configuration crates/krishiv-kernels/src/cast/datetime.rs, crates/krishiv-kernels/src/cast/timestamp.rs, crates/krishiv-kernels/src/cast.rs, crates/krishiv-exec/src/planner/eval/mod.rs, crates/krishiv-plan/src/analyzer/mod.rs, crates/krishiv-plan/src/tests/analyzer.rs |
A shared parser recognizes supported fixed offsets, and timestamp_has_zone detects explicit timestamp zones. ResolutionConf reads the timestamp type and session zone settings. The execution planner uses the shared offset parser. |
Typed literal representation and SQL lowering crates/krishiv-plan/src/expr.rs, crates/krishiv-plan/src/lib.rs, crates/krishiv-sql/src/lower.rs, crates/krishiv-plan/src/display.rs, crates/krishiv-plan/src/encode.rs, crates/krishiv-plan/src/walk.rs, crates/krishiv-plan/src/tests/*, crates/krishiv-sql/src/tests.rs |
The plan adds a typed-literal expression form. SQL lowering retains datetime keywords and raw values instead of parsing them into concrete values. Plan traversal, display, encoding, and tests handle the new expression form. |
Analyzer resolution and zone-aware rendering crates/krishiv-plan/src/analyzer/*, crates/krishiv-sql/tests/analyzer.rs, crates/krishiv-session/tests/session.rs |
The analyzer resolves typed datetime literals using their kind, timestamp configuration, explicit zone, and session zone. It reports invalid literals and unsupported inputs with the specified errors. Expression rendering uses session-zone settings where applicable; tests cover analyzer and session behavior. |
Priority:
Estimated code review effort: 4 (Complex) | ~45 minutes
Possibly related PRs
- KrishivAI/krishiv-engine#180: Changes Spark-style rendering for typed literals and timestamps, which overlaps with this PR’s literal formatting and output-name rendering.
Merge Risk: 
10829
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Malformed session offsets can be accepted inconsistently, and an invalid DATE literal reports the wrong error. These are bounded issues, but the offset validation and test assertions should be corrected before relying on the new behavior.
Security architecture risk: 10829
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The change affects SQL semantics across parsing, analysis, and execution. The reviewed paths preserve execution guards and configuration-aware reuse, with no demonstrated new privilege or access-control bypass. Remaining uncertainty and compatibility limitations warrant a low rather than minimal assessment.
Retained concerns
No architecture-level concerns identified.Security review details
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Security Blast Radius
- inferred — The demonstrated new reachability is from user-supplied SQL literal text and session settings into analysis-time conversion, output naming, and downstream constant evaluation. The inspected conversion path does not introduce catalog, filesystem, network, or identity authority.
Trust Boundaries and Controls
- observed — The syntax-to-execution transition retains two controls: typed literals must bind successfully into concrete values, and unresolved logical roots are rejected before physical planning. The new representation does not itself grant execution eligibility.
Resilience and Maintainability Implications
- inferred — A later conversion failure or interruption does not publish an earlier partially converted plan through the inspected analysis path. Replacement expressions and resolver state are local, and both analyzed-plan construction and session-cache publication follow successful completion.
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Pre-merge checks: 
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Check name Status Explanation Resolution Description check The description follows the template's main sections. It has a What section, a Why section, Spark compatibility notes, Tests, and a list of known divergences. The Checklist and Performance review sect… Add the task, spec, and ADR references under 'Task / spec / ADRs'. Paste the exact test commands and their result lines under 'Tests run' instead of a summary claim. Complete or mark the checklist items, including the Rust API Guidelines se… -
Check name Status Explanation Title check The title names the main change: typed datetime literals (TIMESTAMP, TIMESTAMP_LTZ, TIMESTAMP_NTZ, DATE) resolved in the analyzer. The changeset matches this: the SQL lowering keeps typed literals unr… Docstring Coverage Docstring coverage is 80.26% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 76 functions across 23 files. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Full details: Title check
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Explanation
The title names the main change: typed datetime literals (TIMESTAMP, TIMESTAMP_LTZ, TIMESTAMP_NTZ, DATE) resolved in the analyzer. The changeset matches this: the SQL lowering keeps typed literals unresolved, the analyzer resolves them, and tests cover both. The title is long at 107 characters, but it stays specific and on-topic.
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Full details: Description check
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Explanation
The description follows the template's main sections. It has a What section, a Why section, Spark compatibility notes, Tests, and a list of known divergences. The Checklist and Performance review sections are missing. The Tests section does not paste the commands run and their result lines, which the template asks for. The 'Task / spec / ADRs' line is also absent, and no link to a P2-Txxx task is given. The description states that the kernels, plan, sql, session and exec suites pass, but gives no command output. The author should add the commands and result lines, the task or spec reference, and confirm the checklist items (DCO sign-off, SPDX headers, Spark error class registry use, Rust API guideline items, and performance review).
Resolution
Add the task, spec, and ADR references under 'Task / spec / ADRs'. Paste the exact test commands and their result lines under 'Tests run' instead of a summary claim. Complete or mark the checklist items, including the Rust API Guidelines section for the new public items (
TypedLiteralKind,ExprNode::TypedLiteral,FixedOffset::parse,timestamp_has_zone, and the newResolutionConffields), and the performance review items, since the analyzer changes touch per-row evaluation paths. Also state whether the change adds any dependency.
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Inline comments:
Review comments at @crates/krishiv-kernels/src/cast/datetime.rs:
- Around line 63-64: Update FixedOffset::parse to accept only 1–2 ASCII digits
in each offset field and reject offsets whose total exceeds 18 hours, while
preserving valid offset parsing; add the malformed and over-limit cases to
session_zones_parse_as_fixed_offsets_or_none.
Review comments at @crates/krishiv-plan/src/analyzer/exprs.rs:
- Around line 326-335: Update the `TimestampText::TimeOnly` branch so
`TypedLiteralKind::Date` returns `invalid(type_name)` alongside `TimestampNtz`,
without classifying it as requiring the query clock; preserve the existing
`Timestamp` behavior based on `conf.timestamp_ntz`.
Review comments at @crates/krishiv-plan/src/tests/analyzer.rs:
- Around line 1983-1986: Replace the inequality check in this test with
assertions on each plan’s resolved `Literal::Timestamp` value: expect
1_704_103_200_000_000 µs for UTC and 1_704_083_400_000_000 µs for +05:30. Keep
the assertions focused on the plans’ timestamp literals so the test verifies the
exact offset direction and result.
Review comments at @crates/krishiv-sql/tests/analyzer.rs:
- Around line 573-576: Update the test comparing utc_plan and plus_plan to
assert their exact resolved timestamp instants: 1_704_103_200_000_000 µs for UTC
and 1_704_083_400_000_000 µs for +05:30. Extract the Literal::Timestamp values
from each analyzed plan or compare their rendered timestamp literals, rather
than only asserting the plans differ.
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⛔ Files ignored due to path filters: 2
crates/krishiv-sql/tests/snapshots/lower__constructs_lower_or_are_named_as_unsupported.snapis excluded by!**/*.snapcrates/krishiv-sql/tests/snapshots/lower__literals_are_typed_as_spark_types_them.snapis excluded by!**/*.snap
📒 Files selected for processing: 23
crates/krishiv-exec/src/planner/eval/mod.rscrates/krishiv-kernels/src/cast.rscrates/krishiv-kernels/src/cast/datetime.rscrates/krishiv-kernels/src/cast/timestamp.rscrates/krishiv-plan/src/analyzer/exprs.rscrates/krishiv-plan/src/analyzer/hints.rscrates/krishiv-plan/src/analyzer/mod.rscrates/krishiv-plan/src/analyzer/ops.rscrates/krishiv-plan/src/analyzer/setops.rscrates/krishiv-plan/src/analyzer/subquery.rscrates/krishiv-plan/src/analyzer/windows.rscrates/krishiv-plan/src/display.rscrates/krishiv-plan/src/encode.rscrates/krishiv-plan/src/expr.rscrates/krishiv-plan/src/lib.rscrates/krishiv-plan/src/tests/analyzer.rscrates/krishiv-plan/src/tests/inventory.rscrates/krishiv-plan/src/tests/props.rscrates/krishiv-plan/src/walk.rscrates/krishiv-session/tests/session.rscrates/krishiv-sql/src/lower.rscrates/krishiv-sql/src/tests.rscrates/krishiv-sql/tests/analyzer.rs
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Merging this PR will improve performance by 15.75%2 warnings
Performance Changes
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Footnotes
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Signed-off-by: gopal tathe <44522021+techgopal@users.noreply.github.com> # Conflicts: # crates/krishiv-plan/src/tests/analyzer.rs # crates/krishiv-sql/src/tests.rs
Signed-off-by: gopal tathe <44522021+techgopal@users.noreply.github.com>
Strict session-zone parsing to 1-2 ASCII digits per field with the total capped at 18 hours. DATE with time-only text reports INVALID_TYPED_LITERAL. Session-zone tests assert exact timestamp micros for both zones. Manifests updated for timestamp literals that now resolve. Signed-off-by: gopal tathe <44522021+techgopal@users.noreply.github.com>
Main's new LIMIT/OFFSET and canonicalisation code renders expressions with the one-argument pretty; pass the session zone there as the rest of the resolver does. Two more registry-matrix cases pass (date_part over a TIMESTAMP literal now folds), recorded in the manifest. Signed-off-by: gopal tathe <44522021+techgopal@users.noreply.github.com>
Signed-off-by: gopal tathe <44522021+techgopal@users.noreply.github.com>
Signed-off-by: gopal tathe <44522021+techgopal@users.noreply.github.com>
Main's output names (#180) render literals through spark_fmt; keep that and render a TIMESTAMP literal's name in the session zone, as this branch does, so the cast-to-string helpers are no longer needed. Main's name tests resolve DATE '999999-03-18', which Spark accepts: a DATE literal now skips the timestamp-grammar shape check (its instant is past the microsecond range) and is checked by its own date cast; a bare time of day is still INVALID_TYPED_LITERAL. Registry-matrix manifest re-recorded. Signed-off-by: gopal tathe <44522021+techgopal@users.noreply.github.com>
What
Typed datetime literals are now supported:
TIMESTAMP '...',TIMESTAMP_LTZ '...',TIMESTAMP_NTZ '...'andDATE '...'. Before this change,TIMESTAMP '...'was rejected.TypedLiteralexpression node.Literal, once at analysis time and never per row;CAST('...' AS TIMESTAMP); there is no second datetime parser;TIMESTAMPfollowsspark.sql.timestampType; a value with an explicit zone stays an instant, detected from the kernel's own parse result;spark.sql.session.timeZone.TIMESTAMP '2024-01-01 10:00:00') are rendered with the cast-to-string kernels in the session zone.FixedOffset::parsein the cast kernels) is now shared by the analyzer and the expression evaluator, instead of each keeping a copy.Why
Typed literals are standard Spark SQL and common in queries. Without them, users had to fall back to
CAST(... AS TIMESTAMP_NTZ).Spark compatibility
INVALID_TYPED_LITERALwithvalue/valueTypeat the literal's position.literals.sql: DATE/TIMESTAMP names, types and invalid literals;timestamp.sql: tab-trailing value, invalid values;timestamp-ntz.sqlandtimestampNTZ/timestamp.sql;timestamp-ltz.sql.Tests
spark.sql.timestampType, the session zone, error positions), the golden statements above, and a session test.+05:30session (value and name), and an explicit-zone value whose name renders in the session zone.FixedOffset::parsehas a unit test (offsets, region ids, malformed and out-of-range values).Known divergences / not included
CAST('...' AS TIMESTAMP)still reports an unsupported feature when the session zone is unset.America/Los_Angeles) need the time-zone database. A literal without a zone reportsKRISHIV_UNSUPPORTED_FEATUREthere, as casts do.now,today, a bare time of day) reportKRISHIV_UNSUPPORTED_FEATURE.TIME '...'andINTERVAL '...'typed literals are not included; there are no IR types for them yet.