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[SPARK-19967][SQL] Add from_json in FunctionRegistry
## What changes were proposed in this pull request? This pr added entries in `FunctionRegistry` and supported `from_json` in SQL. ## How was this patch tested? Added tests in `JsonFunctionsSuite` and `SQLQueryTestSuite`. Author: Takeshi Yamamuro <yamamuro@apache.org> Closes #17320 from maropu/SPARK-19967.
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- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala 1 addition, 0 deletions...apache/spark/sql/catalyst/analysis/FunctionRegistry.scala
- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala 34 additions, 2 deletions...ache/spark/sql/catalyst/expressions/jsonExpressions.scala
- sql/core/src/test/resources/sql-tests/inputs/json-functions.sql 13 additions, 0 deletions...re/src/test/resources/sql-tests/inputs/json-functions.sql
- sql/core/src/test/resources/sql-tests/results/json-functions.sql.out 105 additions, 2 deletions...c/test/resources/sql-tests/results/json-functions.sql.out
- sql/core/src/test/scala/org/apache/spark/sql/JsonFunctionsSuite.scala 36 additions, 0 deletions.../test/scala/org/apache/spark/sql/JsonFunctionsSuite.scala
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