tanelk opened a new pull request #29743:
URL: https://github.com/apache/spark/pull/29743
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### What changes were proposed in this pull request?
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Made sure, that all the expressions in the `FunctionRegistry ` have the
fields `usage`, `examples` and `since` filled in their `ExpressionDescription`.
Added assertions to `ExpressionInfo`, to make sure, that all new expressions
will also fill those fields.
### Why are the changes needed?
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Documentation improvement
### Does this PR introduce _any_ user-facing change?
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Better generated SQL built in functions documentation
### How was this patch tested?
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Checked the fix version in the following jiras:
SPARK-1251 - UnaryMinus, Add, Subtract, Multiply, Divide, Remainder,
Explode, Not, In, And, Or, Equals, LessThan, LessThanOrEqual, GreaterThan,
GreaterThanOrEqual, If, Cast
SPARK-2053 - CaseWhen
SPARK-2665 - EqualNullSafe
SPARK-3176 - Abs
SPARK-6542 - CreateStruct
SPARK-7135 - MonotonicallyIncreasingID
SPARK-7152 - SparkPartitionID
SPARK-7295 - bitwiseAND, bitwiseOR, bitwiseXOR, bitwiseNOT
SPARK-8005 - InputFileName
SPARK-8203 - Greatest
SPARK-8204 - Least
SPARK-8220 - UnaryPositive
SPARK-8221 - Pmod
SPARK-8230 - Size
SPARK-8231 - ArrayContains
SPARK-8232 - SortArray
SPARK-8234 - md5
SPARK-8235 - sha1
SPARK-8236 - crc32
SPARK-8237 - sha2
SPARK-8240 - Concat
SPARK-8246 - GetJsonObject
SPARK-8407 - CreateNamedStruct
SPARK-9617 - JsonTuple
SPARK-10810 - CurrentDatabase
SPARK-12480 - Murmur3Hash
SPARK-14061 - CreateMap
SPARK-14160 - TimeWindow
SPARK-14580 - AssertTrue
SPARK-16274 - XPathBoolean
SPARK-16278 - MapKeys
SPARK-16279 - MapValues
SPARK-16284 - CallMethodViaReflection
SPARK-16286 - Stack
SPARK-16288 - Inline
SPARK-16289 - PosExplode
SPARK-16318 - XPathShort, XPathInt, XPathLong, XPathFloat, XPathDouble,
XPathString, XPathList
SPARK-16730 - Cast aliases
SPARK-17495 - HiveHash
SPARK-18702 - InputFileBlockStart, InputFileBlockLength
SPARK-20910 - UUID
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