Github user viirya commented on a diff in the pull request:

    https://github.com/apache/spark/pull/14712#discussion_r76918174
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/SessionCatalog.scala
 ---
    @@ -235,14 +235,18 @@ class SessionCatalog(
        * Note: If the underlying implementation does not support altering a 
certain field,
        * this becomes a no-op.
        */
    -  def alterTable(tableDefinition: CatalogTable): Unit = {
    +  def alterTable(tableDefinition: CatalogTable, fromAnalyze: Boolean = 
false): Unit = {
    --- End diff --
    
    The additional flag parameter `fromAnalyze` looks weird for me. Why would 
we need to have two APIs for alter table and use a flag like this to choose 
among them?


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