[SPARK-24548][SQL] Fix incorrect schema of Dataset with tuple encoders

[viirya]

What changes were proposed in this pull request?

When creating tuple expression encoders, we should give the serializer expressions of tuple items correct names, so we can have correct output schema when we use such tuple encoders.

How was this patch tested?

Added test.

[SparkQA]

Test build #91903 has finished for PR 21576 at commit e349448.

• This patch fails Spark unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

[viirya]

retest this please.

[SparkQA]

Test build #91919 has finished for PR 21576 at commit e349448.

• This patch fails to build.
• This patch merges cleanly.
• This patch adds no public classes.

[viirya]

retest this please.

[SparkQA]

Test build #91921 has finished for PR 21576 at commit e349448.

• This patch fails to build.
• This patch merges cleanly.
• This patch adds no public classes.

[kiszk]

retest this please

[SparkQA]

Test build #91932 has finished for PR 21576 at commit e349448.

• This patch fails to build.
• This patch merges cleanly.
• This patch adds no public classes.

[kiszk]

retest this please

[SparkQA]

Test build #91945 has finished for PR 21576 at commit e349448.

• This patch fails to build.
• This patch merges cleanly.
• This patch adds no public classes.

[viirya]

retest this please.

[SparkQA]

Test build #91951 has finished for PR 21576 at commit e349448.

• This patch fails to build.
• This patch merges cleanly.
• This patch adds no public classes.

[viirya]

Is Jenkins unstable? The building error looks weird...

[viirya]

retest this please.

[SparkQA]

Test build #91953 has finished for PR 21576 at commit e349448.

• This patch fails to build.
• This patch merges cleanly.
• This patch adds no public classes.

[viirya]

cc @cloud-fan Do you have idea about the building error message?

[viirya]

Seems the building for other PRs are also failed.

[kiszk]

One of my PRs has the same problem. When tried to compile more than 20 times, only one try went into the test phase.

[viirya]

retest this please.

[SparkQA]

Test build #91977 has finished for PR 21576 at commit e349448.

• This patch fails to build.
• This patch merges cleanly.
• This patch adds no public classes.

[HyukjinKwon]

retest this please

[viirya]

@HyukjinKwon Looks it passes building now.

[SparkQA]

Test build #92020 has finished for PR 21576 at commit e349448.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[viirya]

cc @cloud-fan for review.

[cloud-fan]

thanks, merging to master!