What does HRESULT 0x8004166E (QPARSE_E_INVALID_LITERAL) mean?

 
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QPARSE_E_INVALID_LITERAL

A present literal is invalid

QPARSE_E_INVALID_LITERAL is the failure HRESULT 0x8004166E (-2147215762 signed; 2147751534 unsigned). Its severity bit is 1, facility is 4 (FACILITY_ITF), and code is 0x166E. AllStat describes it as “Invalid literal.”

Legacy API stage

This result belongs to legacy Windows query parsing and is returned while converting query text into the typed value required by a property and operator. The exact condition is: the numeric/date/currency/GUID form, quoting, locale, suffix or type pairing is invalid. This stage matters because converting the result to a generic COM failure removes the information needed to choose the owner and retry policy.

This value comes from the legacy Indexing Service query parser. The exact final string, parser mode, locale and target property schema matter more than the query text shown in a user interface, because escaping and serialization can alter the token stream before parsing. Current Search SQL documentation can help compare operators and property syntax, but the failing token must still be interpreted under this legacy parser dialect.

Why it appears

  • a stale or transformed raw literal can make the component observe that the numeric/date/currency/GUID form, quoting, locale, suffix or type pairing is invalid.
  • an incomplete property DBTYPE hides the distinction needed to separate this HRESULT from a later catalog or service failure.
  • changes in operator between validation and execution can reproduce the result even when the user-visible input looks unchanged.
  • Retrying this result with the same locale/time zone leaves the decisive contract violation intact.
  • This result can appear when unconsumed suffix disagrees with the state expected while converting query text into the typed value required by a property and operator.

The strongest hypothesis for this HRESULT must account for the operation—converting query text into the typed value required by a property and operator—and the documented condition. A parse failure does not identify the expected token class, property type, locale conversion or escaping layer until the final parser input is preserved.

Developer evidence

  • associate raw literal with the exact UTC timestamp and correlation identifier.
  • compare failing and known-good values for property DBTYPE under the same provider or handler version.
  • record the source and normalization path of operator, not only its display form.
  • use locale/time zone to test whether the failure belongs to parsing, execution, indexing or capability negotiation.
  • preserve unconsumed suffix before objects or work items are released.
  • associate final parser input bytes with the exact UTC timestamp and correlation identifier.

Evidence for this HRESULT should reflect what the component actually received. Preserve a bounded token window, offsets, quote and delimiter state, locale and canonical property identity without logging unrelated query text.

Disciplined troubleshooting

  1. Capture raw literal and property DBTYPE at the call boundary that returns this result.
  2. confirm the operation reached converting query text into the typed value required by a property and operator with the intended operator.
  3. perform the decisive check: capture exact bytes, property DBTYPE, operator, locale and first unconsumed character.
  4. reduce the case until changing locale/time zone alone changes the HRESULT or proves it irrelevant.
  5. apply the recovery only after verifying unconsumed suffix; preserve the original result for comparison.

A useful control for this HRESULT changes one dimension at a time. Begin with a minimal expression using the same property and parser mode, then add the failing literal, operator or delimiter without changing locale or escaping.

Retry conditions

Parse application values before serialization and emit invariant typed syntax. Retry it only after the responsible input or state changes and the previous operation has completed or been cancelled. Retrying identical parser bytes cannot succeed; regenerate the specific token or schema pairing that failed.

Misleading assumptions

It does not prove that the user intent is invalid or that the catalog lacks data; it identifies how this parser interpreted the final serialized expression. Without code-specific evidence for this HRESULT, the value also cannot identify which wrapper, configuration, handler or service transition introduced the condition.

Related query outcomes

EXPECTING_* values mean a required token class is absent; this value rejects a present literal. Keep the symbolic HRESULT beside the stage name in telemetry because nearby constants may require different owners, user messages and retry rules despite the same visible symptom.

Developer and administrator guidance

Retain final parser bytes, query form, token offset, expected token class, locale, escaping path and target property schema. Do not log credentials or unrestricted document content. Before changing catalog schema for this HRESULT, prove the final token stream and property type at the parser boundary.

Concrete troubleshooting case

A date is serialized in a locale-specific order. Invariant typed serialization fixes the comparison. A regression test for this HRESULT should assert the decisive evidence, change only the responsible condition, and include one neighboring HRESULT so future code cannot collapse distinct failures into a generic message.

Official Microsoft references

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