ganeshashree commented on code in PR #58450:
URL: https://github.com/apache/spark/pull/58450#discussion_r4011317982
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionResolution.scala:
##########
@@ -404,6 +388,103 @@ class FunctionResolution(
}
}
+ /**
+ * Returns whether an unqualified function name reaches `system.builtin`
before any temp or
+ * persistent function in the effective SQL PATH. When a temp or persistent
function shadows the
+ * builtin, special-syntax handling that only applies to Spark's builtins
must not fire, since the
+ * name no longer refers to the builtin -- e.g. rejecting a direct star
(bare `*` or qualified
+ * `t.*`) in a routed SQL/JSON function or the `count(tbl.*)` guard.
Parser-built `count(*)` is
+ * normalized to `count(1)` in `AstBuilder` so it skips this probe, but a
DataFrame `count("*")`
+ * keeps its star and does reach the probe during analyzer normalization.
+ *
+ * Precondition: `functionName` must already be known to be a stock built-in
name (as
+ * `functionNameResolvesToBuiltin` ensures by checking
`FunctionRegistry.functionSet` first). This
+ * returns true as soon as the PATH reaches `system.builtin`, without
verifying that
+ * `system.builtin` actually defines a function of this name, so calling it
for a non-builtin name
+ * would wrongly report builtin ownership.
+ */
+ def unqualifiedFunctionResolvesToBuiltinBeforeAnyShadow(functionName:
String): Boolean = {
+ // Walk the PATH in order and stop at the first entry that owns the name.
The default order puts
+ // system.builtin first, so the common case returns on the first entry
with no catalog lookup;
+ // only a custom PATH that lists a persistent catalog ahead of
system.builtin reaches the probe
+ // below (one lookup per such preceding entry, recomputed on each call --
not cached).
+ sqlResolutionPathEntriesForAnalysis.foreach { pathEntry =>
+ val candidate = pathEntry :+ functionName
+ FunctionResolution.sessionNamespaceKind(candidate) match {
+ case
Some(org.apache.spark.sql.catalyst.catalog.SessionCatalog.Builtin) =>
+ return true
+ case Some(org.apache.spark.sql.catalyst.catalog.SessionCatalog.Temp) =>
+ // A visible temp scalar function shadows the builtin; a visible
temp *table* function
+ // makes scalar resolution terminal at this PATH entry
(NOT_A_SCALAR_FUNCTION). Either way
+ // the name never reaches system.builtin, mirroring
`resolveFunctionCandidate`.
+ val ident = FunctionIdentifier(functionName)
+ if (v1SessionCatalog.isTemporaryScalarFunctionVisible(ident) ||
+ v1SessionCatalog.isTemporaryTableFunctionVisible(ident)) {
+ return false
+ }
+ case None =>
+ if (persistentFunctionExists(candidate)) {
+ return false
+ }
+ }
+ }
+ false
+ }
+
+ /**
+ * Returns true when a function reference resolves to the system built-in
with the requested name.
+ * This mirrors [[resolveFunction]] for special parser/analyzer rewrites
that must run only for
+ * Spark's built-ins. In particular, two-part `builtin.name` is not always a
system built-in:
+ * with `spark.sql.legacy.persistentCatalogFirst=true`, an existing
persistent
+ * `current_catalog.builtin.name` takes precedence.
+ */
+ def functionNameResolvesToBuiltin(nameParts: Seq[String], expectedName:
String): Boolean = {
+ if (!FunctionRegistry.functionSet.contains(
+ FunctionRegistry.builtinFunctionIdentifier(expectedName)) ||
+ !FunctionResolution.isUnqualifiedOrBuiltinFunctionName(nameParts,
expectedName)) {
+ return false
+ }
+ nameParts.length match {
+ case 1 =>
+ unqualifiedFunctionResolvesToBuiltinBeforeAnyShadow(nameParts.head)
+ case 2 =>
+ conf.prioritizeSystemCatalog || !persistentFunctionExists(nameParts)
+ case 3 =>
+ true
+ case _ =>
+ false
+ }
+ }
+
+ // All routed SQL/JSON functions (JSON_ARRAY, JSON_VALUE, JSON_QUERY,
JSON_EXISTS) forbid a bare
Review Comment:
Done.
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala:
##########
@@ -950,9 +950,33 @@ object FunctionRegistry {
expression[SchemaOfJson]("schema_of_json"),
expression[LengthOfJsonArray]("json_array_length"),
expression[JsonObjectKeys]("json_object_keys"),
- expression[JsonTypeof]("json_typeof")
+ expression[JsonTypeof]("json_typeof"),
+ // Built-in forms of the SQL:2016 JSON constructor and path functions,
resolved for plain calls
Review Comment:
Done.
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