func convertShow(converter *expressionConverter, v *ast.ShowStmt) (*stmts.ShowStmt, error) {
oldShow := &stmts.ShowStmt{
DBName: v.DBName,
Flag: v.Flag,
Full: v.Full,
GlobalScope: v.GlobalScope,
Text: v.Text(),
}
if v.Table != nil {
oldShow.TableIdent = table.Ident{
Schema: v.Table.Schema,
Name: v.Table.Name,
}
}
if v.Column != nil {
oldShow.ColumnName = joinColumnName(v.Column)
}
if v.Where != nil {
oldWhere, err := convertExpr(converter, v.Where)
if err != nil {
return nil, errors.Trace(err)
}
oldShow.Where = oldWhere
}
if v.Pattern != nil {
oldPattern, err := convertExpr(converter, v.Pattern)
if err != nil {
return nil, errors.Trace(err)
}
oldShow.Pattern = oldPattern.(*expression.PatternLike)
}
switch v.Tp {
case ast.ShowCharset:
oldShow.Target = stmt.ShowCharset
case ast.ShowCollation:
oldShow.Target = stmt.ShowCollation
case ast.ShowColumns:
oldShow.Target = stmt.ShowColumns
case ast.ShowCreateTable:
oldShow.Target = stmt.ShowCreateTable
case ast.ShowDatabases:
oldShow.Target = stmt.ShowDatabases
case ast.ShowTables:
oldShow.Target = stmt.ShowTables
case ast.ShowEngines:
oldShow.Target = stmt.ShowEngines
case ast.ShowVariables:
oldShow.Target = stmt.ShowVariables
case ast.ShowStatus:
oldShow.Target = stmt.ShowStatus
case ast.ShowWarnings:
oldShow.Target = stmt.ShowWarnings
case ast.ShowNone:
oldShow.Target = stmt.ShowNone
}
return oldShow, nil
}
