[DRAFT] Make the return type of lambda functions inferrable#4998

Draft

yuancu wants to merge 81 commits intoopensearch-project:mainfrom

yuancu:issues/4972

Commits on Dec 16, 2025

WIP: try introducing sql validator without disabling the legacy type checking
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Override deriveType in validator to allow type checking on UDTs
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Add special handling for datetime coercion
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Override coerceOperandType and castTo methods to apply casting to udf logics
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Fix interval semantic mismatch between sql and ppl
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Fix quarter interval bug in calcite (counte-react)
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Comment out function overloadings to make basic functions work
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Remove unused validator operators
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Update sargFromJson method in ExtendedRelJson
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Prepend following rules for datetime comparisons: (date, time) -> timestamp; (time, timestamp) -> timestamp (1240/1599)
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Directly delegate type checking to sql type checkers (1292/1599 | 1252/1872)
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Enable IP comparison (1332/1559 | 1409/1915)
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Fix expected type checking for agg functions (1287/1599 | 1423/1914)
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Define operand types for json functions
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Define operand types and return type inferences for array functions (1356/1599 | 1476/1915)
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Add hive sql library operators for array_slice function, which is used in mvindex's implementation (1580/2015)
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Define overrides for atan function to allow conditional sql call rewriting (1579/2015)
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Update operand types for percentile approx to allow with addtional type hint
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Correct span function type routing (allow any)
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Define operand type for DISTINCT_COUNT_APPROX
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Unconditionally rewrite COUNT() to COUNT(*) in sql level to allow type inference (1701/2015)
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Define operand types for EnhancedCoalesce, ScalarMin & Max; remove SqlLibrary.SPARK from lookup table to reduce confusion (1717/2018)
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Correct type checkers for mvappend; fix regexp lookup; correct isempty and isblank (1738/2018)
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Initiate a new RelToSqlConverter every time as it is stateful (1769/2018)
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Override add for string concat and number addition (1773/2018)
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Switch sql dialect to opensearch spark sql dialect (1772/2018)
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Align null order in collation (1783/2018)
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Skip validations for bin-on-timestamps (1799/2027)
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Do not remove sort in subqueries when converting sql to rel (1820/2027)
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Trim unused fields after when converting sql back to rel (1857/2027)
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Pass on join type of logical correlate to lateral join (1858/2027)
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Support semi and anti join in the converted SQL (1860/2027)
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Disable insertion of json_type operator (1864/2027)
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Rewrite IN / NOT IN with tuple inputs to row(...tuple) to conform to correct SQL syntax (1867/2027)
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Update exception type of testSpanByImplicitTimestamp
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Update PplTypeCoercionRule to allow CAST(IP as STRING)
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Fix float literal by inserting compulsory cast
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Extend spark dialect to support cast null to IP (1880/2028)
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Support sql-udt conversion of composite types (1881/2028)
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Add geoip of string override because the udt type is erased during validation (1884/2028)
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Skip validation when grouping by two cases (1885/2028)
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Embed collations into window for streamstats (1910/2054, before rebase: 1887/2028)
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Skip validation when logical values is used to create empty rows (1912/2054)
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Remove EnhancedCoalesceFunction in favor of built-in Coalesce function (1913/2054)
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Fix ITs that are affected by allowing implicit coercion from number to string (1915/2055)
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Return original logical plan when get error message 'Aggregate expressions cannot be nested' (1916/2055)
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Reorganize class structures and refactor for readability
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Commits on Dec 19, 2025

Commits on Dec 22, 2025

Commits on Dec 25, 2025

Define operand type inference for transform function
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